[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

[vsnet-newvar 1682] Re: [vsnet-campaign-unknown 126] GSC 6846:6 starting to fade

Hi Doug,
 
Saw your note today. I've made the following measures of this star:
 
2002          V          V-Rc
Sep 23    11.735    2.084
Oct 10     11.384    2.044
Oct 14     11.377    2.077
Oct 17     11.328    2.041
Oct 19     11.349    2.053
Oct 22     11.339    2.028
Oct 25     11.406    2.084
Oct 29     11.499     ---    
Nov   7     11.687    2.214 (Not ideal conditions)
 
I've determined preliminary values for the star about 15" to the east - V = 10.728 V-R = 0.744. These values may be slightly in error as I still haven't got a good V-R term. I'm using 0.075 but I suspect that it's about 0.150. So the true colour and magnitude are probably redder and fainter. But you might be able to match your measures a bit better with these values available. I've also found values for:
 
GSC 6846 570    8.865    0.656
GSC 6846 529    9.052    0.237
GSC 6846 174  10.200    0.231
 
I think that Arne gets this last star somewhat bluer (10.257  0.153) which confirms my suspicion that I have a problem with the present V-R correction. One of these days the weather will improve and I can sort this out.
 
Regards,
Stan
----- Original Message -----
Sent: Wednesday, November 13, 2002 12:12 AM
Subject: [vsnet-campaign-unknown 126] GSC 6846:6 starting to fade

I was able to add another observation for GSC 6846:6.  The star has started to fade.

Regards,
Doug West


GSC 6846:6 = IRC -30347 = IRAS 18001-2514
Measured position (D. West): RA 18 03 14.47 DEC -25 14 22.1  J2000, 15 GSC 1.1 stars

UT DATE  TIME Photometry Observer 
19990923.42939           8.36C                        MISAO
19990923.42981           8.34C                        MISAO
20000224.83137           8.41C                        MISAO
20000224.83192           8.41C                        MISAO
2002 Sep 18  01:55      11.49             West
2002 Sep 23 08:00 11.807V  9.659Rc   Stan
2002 Sep 30 01:33 11.29V West
2002 Oct 10 08:00 11.384V 9.340Rc    Stan
2002 Oct 14 08:00 11.377V 9.300Rc    Stan
2002 Oct 17 08:00 11.328V 9.287Rc    Stan
2002 Oct 17 01:15 9.21Rc West
2002 Oct 17 01:15 2.01 H alpha West
2002 Oct 18 01:23       11.03V                       West
2002 Oct 19 08:00 11.349V 9.296Rc    Stan
2002 Oct 21 01:21       11.01V                        West
2002 Nov 11 00:30      11.32V                        West

Notes:
1. Tycho 2 B-V = 1.5 per Brian
2. Spectral class: M6
3. West comparison stars: SAO 186183 and GSC 6846:1080. Observations have not been corrected for color differences.
4. Finder chart: http://hometown.aol.com/dwest61506/page25.html
5. The 1999 and 2000 MISAO observations were provided by Seiichi Yoshida.   Seiichi also provided the following information regarding the MISAO observations: Mis KAF-1600 Tycho-2_Catalogue KenIchi_Kadota 0.16-m_f/3.3_hyperboloid_astro-camera_+_MUTOH_CV-16II



VSNET Home Page

Return to Daisaku Nogami

vsnet-adm@kusastro.kyoto-u.ac.jp