Page 2 of 3
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Tue Jun 06, 2017 5:18 pm
by Francois Teyssier
Great work!
Congratulations to all
A comparison of Tim and Peter spectra (resp. R = 9000 and 15000)
Impressive changes
- iras17449+2320b.png (19.37 KiB) Viewed 7540 times
François
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Tue Jun 06, 2017 8:19 pm
by Francisco Campos
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 (7.6 KiB) Viewed 7533 times
- iras17449+2320_ 20170605_869_FPC H-beta.png (16.33 KiB) Viewed 7533 times
- IRAS 17449+2320.gif (21.78 KiB) Viewed 7530 times
Greetings
Fran
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Tue Jun 06, 2017 9:48 pm
by Paolo Berardi
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
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Thu Jun 08, 2017 3:31 pm
by Joan Guarro Flo
Hi,
This is my first contribution of the IRAS 17499+2320. I'll try improve the graphics in de next editions..
Joan.
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Fri Jun 09, 2017 2:06 am
by Tim Lester
Results for June 08: Halpha region at R=9000 and Hbeta region at R = 6300.
Halpha compared to my last result on the 4th
- iras17449+2320_20170608_110_Halpha_tlester.png (20.62 KiB) Viewed 7491 times
- iras_1749+2320_20170608_235_HBeta_tlester.png (24.05 KiB) Viewed 7491 times
Tim
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Sun Jun 11, 2017 12:13 pm
by Olivier GARDE
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Tue Jun 13, 2017 10:34 am
by Jacques Montier
Hello everybody
My contribution to the Be star iras17449+2320
- IRAS_17449+2320.png (68.72 KiB) Viewed 7448 times
Best regards
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Tue Jun 13, 2017 9:23 pm
by Paolo Berardi
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
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Thu Jun 15, 2017 4:42 pm
by James Foster
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
Re: B[e] star IRAS 17449+2320: call for observations
Posted: Thu Jun 15, 2017 11:03 pm
by Paolo Berardi
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
