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

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

Postby Francois Teyssier » Fri Jun 02, 2017 5:46 am

Steve Shore and his team request spectra of the B[e] star IRAS 17449+2320

AD = 17 47 03.27
RA = +23 19 45.3
Mag V ~ 10

Spectra at all resolutions (R > 500) are welcome

According to Steve, something strange may be going on

Send spectra to francoismathieu.teyssier at bbox.fr for inclusion in the base

Photometry (V Band) should be appreciated

See Steve’s notes in http://www.astrosurf.com/aras/novae/Inf ... 017-02.pdf


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

Postby Paolo Berardi » Sat Jun 03, 2017 9:50 am

Hi François and all,

yesterday I observed the star, starting with 150 l/mm grating (already intalled), then with 1200 l/mm one.

The low-res profile (R ~600):

Image

Mid-res profile (R ~5000):

Image

H-alpha line detail:

Image

Photometry V (it's difficult for me to estimate possible systematic errors, so I did't add the error bars). Left group is related to the low-res spectroscopic observation period, right group to the mid-res one.

Image

Sending all data to your e-mail.

Old observations are stored on BeSS database (with the star name BD+23 3183)

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

Postby Olivier GARDE » Sat Jun 03, 2017 2:21 pm

Hi Paolo,

Great spectrum....

I'm not at home for the moment, but when I come back I will try this target with eshel spectrograph.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Peter Somogyi » Sat Jun 03, 2017 2:56 pm

Hello,

I've been proactive here a bit, did observe this star since April but seen no emission in the 6700-7000A range (have quite a few non-detections, not including here).

Comparing to Paolo's profile, the Ha-absorption must have changed a bit (R~2600):
iras17449_2320_20170513_g600.png
iras17449_2320_20170513_g600.png (12.26 KiB) Viewed 899 times


And made a hires (R~17000) attempt earlier:
iras_17449_2320_hires.png
iras_17449_2320_hires.png (17.95 KiB) Viewed 899 times

The H-alpha peaks have varied somewhat (~15%) during these 3 x 1800 sec attempts.
Sent the fits to database.

However, for high resolution I'd guess the OH telluric regions and the LI 6707 was mentioned, and that highest resolution required to detect emission. Again, do have a few negative observations, question if needed in the database at all. If not, first I'd do noisy probes (3-4 minutes) and give high exposures when seeing anything.

- Peter

EDIT: the R~2600 was shot on MAY-13, mistake in the image title. Fits sent are correct.
Last edited by Peter Somogyi on Sat Jun 03, 2017 4:10 pm, edited 1 time in total.
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Peter Somogyi » Sat Jun 03, 2017 3:04 pm

By the way Paolo, congratulations for the Vmag serie!
I'd like to implement something similar, if possible on a 9x50 finder...
- Peter
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Francois Teyssier » Sat Jun 03, 2017 5:41 pm

Congratulations for your reactivity and thanks from Steve for the spectra
The spectra can be download from ARAS database : http://www.astrosurf.com/aras/Aras_DataBase/B_e/IRAS17449+2320.htm

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

Postby Paolo Berardi » Sat Jun 03, 2017 9:42 pm

Thank you, I'm glad if our observations were useful in some way.

The plot of single subexposure profiles shows a slight variation of the h-alpha emission R-peak during the observing session (while V-peak was rather stable). I wonder if it's real (so fast changes?).

Image

Peter, I need to improve my photometry practice. Anyway useful, I think, but I have only the V band filter. So, I have to be careful what reference stars colours and sometime is not possible for me in short time. Here I used the Mak 90 scope, SHV-H9 ccd camera and Baader V filter (I extracted the transmission curve, useful to calibrate the low-res profiles flux). Measures on 30 sec exposure time frames.

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

Postby Peter Somogyi » Sun Jun 04, 2017 8:59 am

Thank you Paolo for the explanation! That setup with the H9 must be quite powerful!
I will open a thread for this topic on the mailing list soon.
- Peter
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Joan Guarro Flo » Sun Jun 04, 2017 11:00 am

Buongiorno Paolo, hi Peter,

The graphical comparison of Halpha is very interesting, I think your arguments are very reasonable. What is the integration time of each?

Your work, confirms that a star is very interesting. Congratulations ! It is a real stimulus to observe it.

Saluti tanti, Cheers, Joan.
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Re: B[e] star IRAS 17449+2320: call for observations

Postby Tim Lester » Sun Jun 04, 2017 7:59 pm

Spectrum for 2017-06-04 at R = 9000.

iras17449+2320_20170604_163_tlester.png
iras17449+2320_20170604_163_tlester.png (16.27 KiB) Viewed 821 times


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