B[e] star IRAS 17449+2320: call for observations

Information about outbursts of eruptive stars, Be activity, ...

Re: B[e] star IRAS 17449+2320: call for observations

Postby Francois Teyssier » Tue Jun 06, 2017 5:18 pm

Great work!
Congratulations to all

A comparison of Tim and Peter spectra (resp. R = 9000 and 15000)
Impressive changes
iras17449+2320b.png
iras17449+2320b.png (19.37 KiB) Viewed 1688 times


François
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Francisco Campos » Tue Jun 06, 2017 8:19 pm

Fantastic spectra from everybody!

Here is my contribution from the last night. I took 12 spectra and did some Johnson V-band photometry (no variation: stable +/-0.005 mag.). Maybe if I reduce all spectra single I will see some kind of variation.

By the way, caution with the H-beta band: it shows some emision profile

_iras17449+2320_20170605_869_FPC.png
_iras17449+2320_20170605_869_FPC.png (7.6 KiB) Viewed 1681 times


iras17449+2320_ 20170605_869_FPC H-beta.png
iras17449+2320_ 20170605_869_FPC H-beta.png (16.33 KiB) Viewed 1681 times


IRAS 17449+2320.gif
IRAS 17449+2320.gif (21.78 KiB) Viewed 1678 times

Greetings
Fran
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Paolo Berardi » Tue Jun 06, 2017 9:48 pm

Hi all, congratulations for your excellent spectra and photometry.

Joan wrote:
What is the integration time of each?


960 sec. The graph shows six consecutive profiles.

Clear sky!
Paolo
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Joan Guarro Flo » Thu Jun 08, 2017 3:31 pm

Hi,
This is my first contribution of the IRAS 17499+2320. I'll try improve the graphics in de next editions..
Joan.
Attachments
_iras17449+2320_20170607_872_JGF.png
_iras17449+2320_20170607_872_JGF.png (38.67 KiB) Viewed 1647 times
_iras17449+2320_20170607_872_JGF1.png
_iras17449+2320_20170607_872_JGF1.png (18.32 KiB) Viewed 1647 times
_iras17449+2320_20170607_872_JGF2.png
_iras17449+2320_20170607_872_JGF2.png (43.19 KiB) Viewed 1647 times
Joan Guarro Flo
 
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Tim Lester » Fri Jun 09, 2017 2:06 am

Results for June 08: Halpha region at R=9000 and Hbeta region at R = 6300.

iras17449+2320_20170608_110_tlester.png


Halpha compared to my last result on the 4th
iras17449+2320_20170608_110_Halpha_tlester.png
iras17449+2320_20170608_110_Halpha_tlester.png (20.62 KiB) Viewed 1639 times


iras_1749+2320_20170608_235_tlester.png

iras_1749+2320_20170608_235_HBeta_tlester.png
iras_1749+2320_20170608_235_HBeta_tlester.png (24.05 KiB) Viewed 1639 times


Tim
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Olivier GARDE » Sun Jun 11, 2017 12:13 pm

Spectrum of IRAS 17449+2320 taken last night with my eshel spectrograph and Astrosib RC 400 telescope

Image

Image

Image

Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Jacques Montier » Tue Jun 13, 2017 10:34 am

Hello everybody

My contribution to the Be star iras17449+2320

IRAS_17449+2320.png
IRAS_17449+2320.png (68.72 KiB) Viewed 1596 times


Best regards
--
Jacques Montier
Societe d'Astronomie de Rennes
IAU code J23
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Paolo Berardi » Tue Jun 13, 2017 9:23 pm

Very nice observations! Your spectra prove that there are relatively fast changes. Tim spectrum confirms variations on R-peak h-alpha emission line. Also h-beta line profile changed a lot in just two days. On ArasBeAm the star has an expected observation period of 365 days. I wonder if the star is currently undergoing a particular event. We look forward to read news from François/Steve...

Paolo
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Re: B[e] star IRAS 17449+2320: call for observations

Postby James Foster » Thu Jun 15, 2017 4:42 pm

Is there an AASVO Designation/Chart for this object? If there is, I'll take photometry as well as spectra
when I'm at my dark sky/high altitude site starting tomorrow night.

James
James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope,
Alpy 600, and Star Analyzer 200
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Paolo Berardi » Thu Jun 15, 2017 11:03 pm

Hi James, I don't know (it seems not). I used APASS V magnitudes (https://www.aavso.org/apass) included in UCAC4 catalog.

Maybe Fran or someone else can give other suggestions (I'm not expert).

Paolo
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