From jop at astro.columbia.edu Wed Feb 1 07:46:23 2012 From: jop at astro.columbia.edu (Joe Patterson) Date: Wed, 01 Feb 2012 07:46:23 -0500 Subject: (cba:news) Fwd: [vsnet-alert 14163] Re: Outburst of a possible new cataclysmic variable 1RXS J063214.8+253620 Message-ID: <4F29341F.3090401@astro.columbia.edu> New transient in Gemini. Enrique and Gianluca Masi have been carrying the torch on this one, which appears to be a peculiar star with 3.8 hr photometric waves. Urgent need for data from USA longitudes - before the star fades! joe -------- Original Message -------- Subject: [vsnet-alert 14163] Re: Outburst of a possible new cataclysmic variable 1RXS J063214.8+253620 Date: Sat, 28 Jan 2012 21:30:39 +0400 From: Korotkiy Stas To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp Dear , Seiichi Yoshida just got new pictures: 06 32 13.082 +25 36 22.68 +-0.1" (D=400mm, F=3200mm) Best regards, Stas 28.01.2012, 20:08, "Seiichi Yoshida" : > Dear Korotkiy Stas, > > Here is our astrometry of this object. > > R.A. 06h32m13s.09, Decl. +25o36'22".2 (J2000.0) > > Best regards, > >> Dear Korotkiy Stas, >> >> Congratulations for your discovery of this outburst. Here I report the >> MISAO Project observations by Youichirou Nakashima. We confirmed the >> outrburst on our Jan. 26 survey images. >> >> 1RXS_J063214.8+253620 20120126.62110 124C Mis >> 1RXS_J063214.8+253620 20120126.61976 124C Mis >> 1RXS_J063214.8+253620 20120126.61841 124C Mis >> 1RXS_J063214.8+253620 20120126.61707 125C Mis >> 1RXS_J063214.8+253620 20111225.77596 148C Mis >> 1RXS_J063214.8+253620 20111225.77463 149C Mis >> 1RXS_J063214.8+253620 20111225.77329 148C Mis >> 1RXS_J063214.8+253620 20111217.80168 153C Mis >> 1RXS_J063214.8+253620 20111217.80034 151C Mis >> 1RXS_J063214.8+253620 20111217.79899 154C Mis >> 1RXS_J063214.8+253620 20111123.69036 149C Mis >> 1RXS_J063214.8+253620 20111123.68903 149C Mis >> 1RXS_J063214.8+253620 20111123.68769 148C Mis >> 1RXS_J063214.8+253620 20110222.53337 149C Mis >> 1RXS_J063214.8+253620 20110222.53203 149C Mis >> 1RXS_J063214.8+253620 20110222.53068 151C Mis >> 1RXS_J063214.8+253620 20110203.61891 150C Mis >> 1RXS_J063214.8+253620 20110203.61755 150C Mis >> 1RXS_J063214.8+253620 20110203.61617 151C Mis >> 1RXS_J063214.8+253620 20110203.61480 151C Mis >> 1RXS_J063214.8+253620 20110126.59088 150C Mis >> 1RXS_J063214.8+253620 20110110.64743 152C Mis >> 1RXS_J063214.8+253620 20110110.64606 153C Mis >> 1RXS_J063214.8+253620 20110110.64470 152C Mis >> >> Best regards, >>> A bright (unfiltered magnitude 12.65) optical transient source was detected on 2012 January 27 at position 06:32:13.06 +25:36:22.5 (+/-0.3", J2000). Inspection of previous images of this field revealed that the object is also present on images from January 24, 25, and 26 but is below the detection limit (typically around 13.5m) on January 20 and 21. >>> >>> Date JD mag. >>> 2012-01-20.740 2455947.240 >13.5 >>> 2012-01-21.701 2455948.207 >13.5 >>> 2012-01-24.759 2455951.259 13.10 +/-0.05 >>> 2012-01-25.845 2455952.346 12.81 +/-0.03 >>> 2012-01-26.833 2455953.333 12.66 +/-0.03 >>> 2012-01-27.897 2455954.397 12.61 +/-0.03 >>> The observations were obtained with a wide-field survey camera (F=135mm f/2.0 telephoto lens equipped with ST8300M CCD) operated by Ka-Dar Observatory at the Mountain station of Kazan State University (Karachay-Cherkessia, Russia). The instrumental magnitude scale is calibrated using V magnitudes of Tycho-2 (Hog et al., 2000, A&A, 355L, 27) stars in the field of view. >>> >>> The optical transient is associated with an ultraviolet object GALEX J063213.0+253623 (FUV=18.42 +/-0.05, NUV=17.90 +/-0.03) located 0.7" from the measured optical position (see http://galex.stsci.edu/GR6/ ). The transient is 24" away from an unidentified X-ray source 1RXS J063214.8+253620 listed in the ROSAT All Sky Survey Faint Source Catalog (Voges et al., 2000, IAUC, 7432) and is likely associated with it. The All Sky Automated Survey (ASAS-3, Pojmanski 2001, ASPC, 246, 53; http://www.astrouw.edu.pl/asas/ ) database lists two detections of a source at the above position: >>> >>> Date HJD V >>> 2009-03-17 2454907.54944 12.82 +/-0.06 >>> 2009-03-21 2454911.53385 12.95 +/-0.06 >>> which may be the previous outburst of this object. We conclude that the observed optical transient source is likely a previously unknown cataclysmic variable in outburst. >>> >>> Follow-up photometric and astrometric observations are requested. >>> >>> The discovery images may be found here: >>> http://scan.sai.msu.ru/~kirx/ATel/1RXSJ063214/ >>> >>> http://www.astronomerstelegram.org/?read=3893 >> -- >> Seiichi Yoshida >> comet at aerith.net >> http://www.aerith.net/ > > -- > Seiichi Yoshida > comet at aerith.net > http://www.aerith.net/ From jop at astro.columbia.edu Fri Feb 17 12:00:24 2012 From: jop at astro.columbia.edu (Joe Patterson) Date: Fri, 17 Feb 2012 12:00:24 -0500 Subject: (cba:news) those baffling luminous stars at short period... Message-ID: <4F3E87A8.3080001@astro.columbia.edu> An embedded and charset-unspecified text was scrubbed... Name: cba217.txt URL: From jop at astro.columbia.edu Tue Feb 21 15:11:23 2012 From: jop at astro.columbia.edu (Joe Patterson) Date: Tue, 21 Feb 2012 15:11:23 -0500 Subject: (cba:news) DW Cnc in outburst? In-Reply-To: <023B2CDC006844ABA7AE82E39B5B8078@user04d86f27c6> References: <023B2CDC006844ABA7AE82E39B5B8078@user04d86f27c6> Message-ID: <4F43FA6B.3080401@astro.columbia.edu> Hi CBAers, This report from Rod Stubbings is definitely worth a few nights of close scrutiny. No one has ever seen DW Cnc in an "outburst" state, and as a DQ Her star, the presence and amplitude of the fast periodic signal (39 minutes) is of great significance. Unfortunately it's in the same strip of sky hosting other glamor stars of Jan->Mar, esp. BK Lyn and ER UMa. I never said it would be easy! joe -------- Original Message -------- Return-Path: