AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Information about outbursts of eruptive stars, Be activity, ...
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Robin Leadbeater
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AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

Note request for spectroscopic observations of this object (current v magnitude 7.7)

Robin



> AAVSO Alert Notice 454
>
> Monitoring of CH Cyg requested for Chandra and HST observations
> March 2, 2012
>
> Dr. Margarita Karovska, Harvard-Smithsonian Center for Astrophysics,
> has requested visual and photometric observations of the symbiotic
> variable CH Cyg in preparation for and support of Chandra and HST
> observations scheduled for later in March 2012. Dr. Karovska's
> observations will be a followup investigation of the central region
> of CH Cyg and its jet that was discovered a couple of years ago.
> AAVSO observations are requested to in order to monitor the state
> of the system and correlate with the satellite observations.
>
> Visual observations and CCD/PEP observations in all bands - U
> through J and H - are requested. Daily observations now through April
> 2012 and high-speed photometry through March would be appreciated.
> CH Cyg is currently at visual magnitude 7.7.
>
> Halpha, OIII region, and optical spectroscopy are also requested.
>
> More details on the exact dates and times of the satellite
> observations will be announced when they become available, but
> daily monitoring should begin now.
>
> Coordinates: RA 19 24 33.07 Dec. +50 14 29.1 (J2000.0)
>
> Finder charts may be plotted using the AAVSO International Variable
> Star Plotter (VSP) at http://www.aavso.org/vsp.
>
> Please report observations to the AAVSO International Database as CH CYG.
>
> Many thanks for your valuable contributions to this interesting research!
>
> This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
>
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

Here are my tests at H alpha from last night. It is M7, so much brighter at H alpha. A straightforward target for a LHIRES with 2400 grating

Robin
Tests on CH Cyg usin LHIRES  2400
Tests on CH Cyg usin LHIRES 2400
chcyg_ha_4mar12_necal_respcor.png (10.84 KiB) Viewed 34442 times
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Robin Leadbeater
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

Here is the O[III] region. The spectra are again very complex but repeatable except for the emission line at ~5017A which appeared to increase significantly over the 2 hours I observed it.

Wvelength calibation was done using a mixture of Ne, Ar and Xe lines from a "Filly dot" lamp. I could not identify enough faint lines to do a good calibration using the internal neon.

Robin
CH Cyg O[III] region
CH Cyg O[III] region
chcyg_oiii_5mar12_fillydot7cal_respcor_helcor.png (13.12 KiB) Viewed 34431 times
showing short term variation in 5017A emission line
showing short term variation in 5017A emission line
chcyg_oiii_5mar12_5017A_fillydot7cal_respcor_helcor_.png (7.8 KiB) Viewed 34431 times
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Robin Leadbeater
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

Attached is the O[III] spectrum with the emission lines marked (CH Cyg has an RV of -60km/s)

I have had some feedback from Margarita Karovska. To cover all the lines Margarita is interested in, we need someone with an eShel to take some spectra or perhaps even a LISA. The HST/Chandra observations are next week.

Thanks
Robin


----- Original Message -----
From: "Margarita Karovska" <karovska@head.cfa.harvard.edu>
To: "Robin Leadbeater" <robin@threehillsobservatory.co.uk>;
Sent: Tuesday, March 06, 2012 9:35 PM
Subject: Re: Alert Notice 454: Monitoring of CH Cyg


>
> Hi Robin,
> Thank you VERY MUCH!
> The spectra look very nice.
> The variability in Halpha is possible and very interesting!
>
>
> Continuing with the Halpha and [OIII] will be great.
>
>
> ***this is extra, and maybe pushing it... but
> I have a question:
>
> Can you go as low as 4363 A
> there is another [OIII] line there that we will use in the imaging for a
> ratio with the 5007 A line.
> Also,
> It will be great to have spectra around the continuum at ~5470A
> We use the image at this wavelength for continuum subtraction from the
> 5007 A image.
>
> I don't know if any of these are a possibility, but the [SII] line at
> 6731A is of interest as well as He I 5876 A
> He II 4686 A lines.
>
>
> Any of these will be wonderful to have, especially for the period of the
> HST run sometime between 3/12 and 3/19 (and if possible before and after)
>
>
> Thank you for the spectra and your kind help with this.
> It provides a context for the HST/Chandra observations and with the
> other coordinated observations may lead to unexpected results concerning
> this fascinating object.
>
> All the best,
> Margarita
CH Cyg O[III] region with emission lines annotated
CH Cyg O[III] region with emission lines annotated
chcyg_oiii_helcor_annotated.png (7.85 KiB) Viewed 34426 times
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Thierry Garrel
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Thierry Garrel »

Here is my last observation a 3X1200s exposure with my eshell setup (R10000). This star was relatively low at the moment of exposure, 17° but still have strong spectral features easy to spot on the yellow/red régions. It is more difficult due to absorption in the blue. I have sent the spectra, individual orders, directly to Margarita. We can extend coverage in NIR if needed.
Nice object.
Attachments
continnuum
continnuum
ch_cyg_20120307_013_continuum.png (6.51 KiB) Viewed 34406 times
HeI 5876
HeI 5876
ch_cyg_20120307_013_HeI5876.png (6.28 KiB) Viewed 34406 times
[SII]6731
[SII]6731
ch_cyg_20120307_013_[SII]6731.png (6.15 KiB) Viewed 34406 times
HeII 4686
HeII 4686
ch_cyg_20120307_013_HeII4686.png (7.11 KiB) Viewed 34406 times
[OIII] 5007
[OIII] 5007
ch_cyg_20120307_013_[OIII]5007.png (5.96 KiB) Viewed 34406 times
H alpha
H alpha
ch_cyg_20120307_013_Halpha.png (6.15 KiB) Viewed 34406 times
Robin Leadbeater
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

That's great :-)

Attached is my heliocentric O[III] region spectrum from the previous night (fits, mean of 3) How does it compare? Has the unidentified emission at ~5018 A changed any more?

Cheers
Robin
Attachments
chcyg_oiii_40-57_5mar12_fillydot7cal_respcor_helcor.zip
(3.39 KiB) Downloaded 1495 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Thierry Garrel
Posts: 193
Joined: Mon Sep 26, 2011 2:52 pm
Location: Montpellier
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Thierry Garrel »

Robin,
i forgot to attached the zip of the entire orders. It is a good test for the filly lamp calibration method. I had did this test during del sco HeII4686 monitoring to be sure of.
I will reduce individual exposure, 3X1200s to look for 5018A variability. But not quite sure of the SNR.
Amitiés
T
Attachments
20120307-001840-CHcyg-3x1200s_TGarrel.zip
22 orders echelle spectra
(137.83 KiB) Downloaded 1493 times
Thierry Garrel
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Thierry Garrel »

It match quite well, but my spectra is more noisy than yours. No differences seen.
Thierry Garrel
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Thierry Garrel »

Very sensitive to normalisation. I don't think it moves.
Attachments
Blue Robin Pink me
Blue Robin Pink me
5017 comp.png (13.1 KiB) Viewed 34389 times
Robin Leadbeater
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Re: AAVSO Alert Notice 454: Monitoring of CH Cyg requested

Post by Robin Leadbeater »

Here is a good reference from Margarita for optical spectra of CH Cyg .

Burmeister and Leedjarv, 2009, A&A, 504, 171.
http://cds.aanda.org/articles/aa/pdf/20 ... 686-09.pdf

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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