Alert! Nova Cas 2021 mag 9
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Re: Alert! Nova Cas 2021 mag 9
An blue-UV spectrum taken by using UVEX spectrograph on a 200 mm Newton stopped at 125 mm diameter (April 8):
A visible spectral range spectrum captured by using Star'Ex spectrograph and a 200-mm Newton (April 9):
Christian Buil
A visible spectral range spectrum captured by using Star'Ex spectrograph and a 200-mm Newton (April 9):
Christian Buil
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Nova Cas 2021 Alpy spectrum evening of 2021 Apr 11
Here is my latest Alpy spectrum of Nova Cas 2021 at 23deg above my northern horizon. Continued Balmer and HeI emission all with strong P Cygni profiles, such a stable nova!
Hugh Allen
Alpy 600 user
Alpy 600 user
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Re: Alert! Nova Cas 2021 mag 9
Hello all,
Nice spectrum Hugh because the nova cannot be caught so easily above the horizon in the early evening !
For me, the nova now becomes observable in better conditions in the second part of the night and so, the following spectrum was obtained the 14th of April at 1 h 38 TU (resolution of 525, JJ = 2459318.568) with my Alpy 600 and an acquisition time of 45 min (15 x 180s) :
The Si II lines at 5958 (?), 5979 (?), 6347 and 6371A are still clearly visible.
Evolution of the Nova Cas 2021 from March 20 to April 14 : The general appearance of the spectrum remains steadly the same over the days.
Evolution of the Halpha line : Since April 4, the P Cyg profile of the Halpha line shows little changes at low resolution.
Clear skies to all !!
Christophe BOUSSIN
Nice spectrum Hugh because the nova cannot be caught so easily above the horizon in the early evening !
For me, the nova now becomes observable in better conditions in the second part of the night and so, the following spectrum was obtained the 14th of April at 1 h 38 TU (resolution of 525, JJ = 2459318.568) with my Alpy 600 and an acquisition time of 45 min (15 x 180s) :
The Si II lines at 5958 (?), 5979 (?), 6347 and 6371A are still clearly visible.
Evolution of the Nova Cas 2021 from March 20 to April 14 : The general appearance of the spectrum remains steadly the same over the days.
Evolution of the Halpha line : Since April 4, the P Cyg profile of the Halpha line shows little changes at low resolution.
Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9
Hello all,
Here is my update for the monitoring of the Nova Cas 2021 with two new spectra.
The first one was obtained the 16th of April at 0 h 58 TU (resolution of 512, JJ = 2459320.5402) with my Alpy 600 and an acquisition time of 60 min (12 x 300s) :
and the second one was obtained the 18th of April at 1 h 33 TU (resolution of 522, JJ = 2459322.5645) with my Alpy 600 and an acquisition time of 40 min (20 x 120s) :
Evolution of the Nova Cas 2021 from March 20 to April 18 : Evolution of the Halpha line : I note a decrease in the relative intensity of the HeI lines as well as a displacement of the "blue" part of the P Cyg profile (here on the HeI line at 5876A). Clear skies to all !!
Christophe BOUSSIN
Here is my update for the monitoring of the Nova Cas 2021 with two new spectra.
The first one was obtained the 16th of April at 0 h 58 TU (resolution of 512, JJ = 2459320.5402) with my Alpy 600 and an acquisition time of 60 min (12 x 300s) :
and the second one was obtained the 18th of April at 1 h 33 TU (resolution of 522, JJ = 2459322.5645) with my Alpy 600 and an acquisition time of 40 min (20 x 120s) :
Evolution of the Nova Cas 2021 from March 20 to April 18 : Evolution of the Halpha line : I note a decrease in the relative intensity of the HeI lines as well as a displacement of the "blue" part of the P Cyg profile (here on the HeI line at 5876A). Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9
A Star'Ex spectrum taken the April 19.122 (I use here a 200 mm Newton stopped to 125 mm diameter and an experimental Star'Ex version (use special optical glass):
A high contrast version:
Christian Buil
A high contrast version:
Christian Buil
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Re: Alert! Nova Cas 2021 mag 9
Hello all,
Here is my last spectrum of the Nova Cas 2021 obtained the 21th of April at 0 h 42 TU (resolution of 518, JJ = 2459325.5292) with my Alpy 600 and an acquisition time of 60 min (20 x 180s) :
The FeII line at 5169 A is clearly visible in the spectrum of the Nova Cas 2021 and the Fe II lines at 4923 and 5018 A are blended with the helium lines.
Evolution of the Nova Cas 2021 from March 20 to April 21 : Clear skies to all !!
Christophe BOUSSIN
Here is my last spectrum of the Nova Cas 2021 obtained the 21th of April at 0 h 42 TU (resolution of 518, JJ = 2459325.5292) with my Alpy 600 and an acquisition time of 60 min (20 x 180s) :
The FeII line at 5169 A is clearly visible in the spectrum of the Nova Cas 2021 and the Fe II lines at 4923 and 5018 A are blended with the helium lines.
Evolution of the Nova Cas 2021 from March 20 to April 21 : Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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- Posts: 170
- Joined: Sun Aug 21, 2016 6:04 pm
Re: Alert! Nova Cas 2021 mag 9
Hello all,
Here is our last spectrum of the Nova Cas 2021 obtained the 23th of April at 2 h 05 TU (resolution of 517, JJ = 2459327.5868) with an Alpy 600 and an acquisition time of 60 min (30 x 120s) :
Back to...the past, the Fe II line (42) at 5169A is visible from April 16 in our spectra...
The FeII lines (42) at 4923, 5018 and 5169 A have remained broadly unchanged since our last spectrum on April 21. Could Fe II (49) lines be visible in our latest spectra ?
Evolution of the Nova Cas 2021 from March 20 to April 21 : Clear skies to all !!
Marion THOMAS and Christophe BOUSSIN
Here is our last spectrum of the Nova Cas 2021 obtained the 23th of April at 2 h 05 TU (resolution of 517, JJ = 2459327.5868) with an Alpy 600 and an acquisition time of 60 min (30 x 120s) :
Back to...the past, the Fe II line (42) at 5169A is visible from April 16 in our spectra...
The FeII lines (42) at 4923, 5018 and 5169 A have remained broadly unchanged since our last spectrum on April 21. Could Fe II (49) lines be visible in our latest spectra ?
Evolution of the Nova Cas 2021 from March 20 to April 21 : Clear skies to all !!
Marion THOMAS and Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9
Star'Ex spectrum the April 24.1, 2021:
(8-inch Newton f/5 telescope stopped at f/8 -> 3750-7100 A valuable spectral range).
Christian Buil
(8-inch Newton f/5 telescope stopped at f/8 -> 3750-7100 A valuable spectral range).
Christian Buil
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Re: Alert! Nova Cas 2021 mag 9
ATel:
ATEL #14577 ATEL #14577
Title: V1405 Cas (= PNV J23244760+6111140) now displaying Fe II emission
Author: S. N. Shore (Univ. of Pisa), C. Buil, P. Dubovsky, P. Berardi,
M. Bajer, C. Boussin, J. Guarrò, F. Teyssier, E. Bertrand, J. M.
Viannet, D. Boyd, F. Boubault, H. Allen, M. Le Lain, P. le Dû, P.
Cazzato, J. Coffin, K. Shank, E. Bressinck, O. Garde, K. Gurney, R.
Leadbeater (ARAS Group)
Queries: steven.neil.shore@unipi.it
Posted: 26 Apr 2021; 12:56 UT
Subjects:Optical, Nova, Transient
We report that the slow nova Cas 2021 (V1405 Cas = PNV J23244760+6111140), discovered in outburst on 2021 Mar 18.4 (CBET #4945, ATel #14471, #14472, #14476, #14478, #14482, #14530) has begun to display Fe II absorption features.
The nova has been continually monitored by ARAS observers with a variety of telescopes (ranging from 20 to 28 cm and with spectrographs ranging in resolution from about
518 to 9500 covering the optical interval from about 3400 - 7600 A since
2021 Mar. 19.7UT with an accumulated archive to date of over 90 spectra (all spectra and observational details are available from the ARAS archive
website).
The last spectrum to show no evidence for any Fe II absorption was obtained on 2021 Apr. 03.7UT; a very narrow emission at Fe II 5169 (FWZI ~ 100 km/s, vrad ~ 0 km/s) was present but the upper limit to any absorption at vrad>
-2000 km/s was EW < 0.010 A) while on 2021 Apr. 6.7UT a strong, detached absorption was present (0.5 A) with a minimum at -1200 km/s (FWZI ~ 500 km/s), confirmed on Apr. 7.7UT). The absorption was both stronger (2.3
A) and broader (FWZI ~ 2000 km/s) on Apr 19.2UT; most strong optical of Fe II permitted showed similar profiles. In contrast, during the last observation, Si II 6347 showed very weak absorption and both Si II components continued to show the same narrow emission at vrad ~ 0 km/s as the Fe II lines. The P Cyg-like profiles on He I 4471, 5876, 6678, and 7065A showed the absorption component maximum radial absorption velocities of -1600 km/s contiguous with a broad emission component that extended to +1600 km/s (there was also enhanced emission at vrad ~ 0 km/s on these lines).
Although absent on Apr. 14.8UT, Ca II K appeared in absorption on Apr.19.7 (vrad = -900 km/s, EW = 1.5A, no emission) and, aside from the Balmer, He I, Fe II, and Si II lines, the only other feature is a complex emission centered at around 6244 A (Fe II and Al II).
The hydrogen series showed a systematic development. Although an absorption component on Halpha extending to -2500 km/s had been detected in the earlier spectra on Mar. 22UT, that had disappeared by Apr. 3 to be replaced by emission extending to the same velocity and a strong absorption core at about the same velocity as the He I and metal ion transitions, -1600 km/s; the blueward emission had vanished by Apr.22; the maximum emission velocity remains about -2000 km/s. The Balmer series in the last spectra, Apr.
19, showed a progression in the radial velocity of the absorption minimum from -1200 km/s at Halpha to -1000 km/s at Hdelta but with the same maximum velocities of -1600 km/s
(absorption) and +2000 km/s (emission).
Observations are continuing and will be available through the URL linked below.
------------------------------------------------------------------------------
Password Certification: S. N. Shore (shore@df.unipi.it)
https://www.astronomerstelegram.org/?read=14577
ATEL #14577 ATEL #14577
Title: V1405 Cas (= PNV J23244760+6111140) now displaying Fe II emission
Author: S. N. Shore (Univ. of Pisa), C. Buil, P. Dubovsky, P. Berardi,
M. Bajer, C. Boussin, J. Guarrò, F. Teyssier, E. Bertrand, J. M.
Viannet, D. Boyd, F. Boubault, H. Allen, M. Le Lain, P. le Dû, P.
Cazzato, J. Coffin, K. Shank, E. Bressinck, O. Garde, K. Gurney, R.
Leadbeater (ARAS Group)
Queries: steven.neil.shore@unipi.it
Posted: 26 Apr 2021; 12:56 UT
Subjects:Optical, Nova, Transient
We report that the slow nova Cas 2021 (V1405 Cas = PNV J23244760+6111140), discovered in outburst on 2021 Mar 18.4 (CBET #4945, ATel #14471, #14472, #14476, #14478, #14482, #14530) has begun to display Fe II absorption features.
The nova has been continually monitored by ARAS observers with a variety of telescopes (ranging from 20 to 28 cm and with spectrographs ranging in resolution from about
518 to 9500 covering the optical interval from about 3400 - 7600 A since
2021 Mar. 19.7UT with an accumulated archive to date of over 90 spectra (all spectra and observational details are available from the ARAS archive
website).
The last spectrum to show no evidence for any Fe II absorption was obtained on 2021 Apr. 03.7UT; a very narrow emission at Fe II 5169 (FWZI ~ 100 km/s, vrad ~ 0 km/s) was present but the upper limit to any absorption at vrad>
-2000 km/s was EW < 0.010 A) while on 2021 Apr. 6.7UT a strong, detached absorption was present (0.5 A) with a minimum at -1200 km/s (FWZI ~ 500 km/s), confirmed on Apr. 7.7UT). The absorption was both stronger (2.3
A) and broader (FWZI ~ 2000 km/s) on Apr 19.2UT; most strong optical of Fe II permitted showed similar profiles. In contrast, during the last observation, Si II 6347 showed very weak absorption and both Si II components continued to show the same narrow emission at vrad ~ 0 km/s as the Fe II lines. The P Cyg-like profiles on He I 4471, 5876, 6678, and 7065A showed the absorption component maximum radial absorption velocities of -1600 km/s contiguous with a broad emission component that extended to +1600 km/s (there was also enhanced emission at vrad ~ 0 km/s on these lines).
Although absent on Apr. 14.8UT, Ca II K appeared in absorption on Apr.19.7 (vrad = -900 km/s, EW = 1.5A, no emission) and, aside from the Balmer, He I, Fe II, and Si II lines, the only other feature is a complex emission centered at around 6244 A (Fe II and Al II).
The hydrogen series showed a systematic development. Although an absorption component on Halpha extending to -2500 km/s had been detected in the earlier spectra on Mar. 22UT, that had disappeared by Apr. 3 to be replaced by emission extending to the same velocity and a strong absorption core at about the same velocity as the He I and metal ion transitions, -1600 km/s; the blueward emission had vanished by Apr.22; the maximum emission velocity remains about -2000 km/s. The Balmer series in the last spectra, Apr.
19, showed a progression in the radial velocity of the absorption minimum from -1200 km/s at Halpha to -1000 km/s at Hdelta but with the same maximum velocities of -1600 km/s
(absorption) and +2000 km/s (emission).
Observations are continuing and will be available through the URL linked below.
------------------------------------------------------------------------------
Password Certification: S. N. Shore (shore@df.unipi.it)
https://www.astronomerstelegram.org/?read=14577
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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- Joined: Sun Aug 21, 2016 6:04 pm
Re: Alert! Nova Cas 2021 mag 9
Hello all,
Here is my last spectrum of the Nova Cas 2021 obtained the 27th of April at 1 h 10 TU (resolution of 534, JJ = 2459331.5488) with an Alpy 600 and an acquisition time of 60 min (30 x 120s) :
The relative intensities of the FeII lines have clearly increased since April 25 !
Evolution of FeII lines (42) between April 18 and 27 : Evolution of FeII lines (27) and (28) between April 18 and 27 : At the same time, the relative intensities of the HeI lines have significantly decreased !
Evolution of the HeI line at 5876A (for example) :
Clear skies to all !!
Christophe BOUSSIN
Here is my last spectrum of the Nova Cas 2021 obtained the 27th of April at 1 h 10 TU (resolution of 534, JJ = 2459331.5488) with an Alpy 600 and an acquisition time of 60 min (30 x 120s) :
The relative intensities of the FeII lines have clearly increased since April 25 !
Evolution of FeII lines (42) between April 18 and 27 : Evolution of FeII lines (27) and (28) between April 18 and 27 : At the same time, the relative intensities of the HeI lines have significantly decreased !
Evolution of the HeI line at 5876A (for example) :
Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database