COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS. Reports on New Discoveries
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1 1 COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Konkoly Observatory Budapest HU ISSN Reports on New Discoveries (This will appear as IBVS No ) Previous reports can be found in Date: 27 September 2011 Monninger, G. - Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.v. (BAV), Munsterdamm 90, DE Berlin, Germany, gerold.monninger@online.de DSCT (Vmag - GSC2.3) (1) d (7) GSC = USNO-A = USNO-B = Tycho = 2MASS = GSC2.3 N2XB Date: 8 December 2011 Liakos, A. - Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens, Panepistimioupolis, GR , Zografos, Athens, Hellas, alliakos@phys.uoa.gr Niarchos, P. - Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens, Panepistimioupolis, GR , Zografos, Athens, Hellas, pniarcho@phys.uoa.gr Remark: Detected in the FoV of V482 Per DSCT B= mag (The Hipparcos and Tycho Catalogues) h - GSC = TYC = USNO-A Remark: Detected in the FoV of TW Lac and V413 Lac DSCT B=13.9 mag (The USNO-A2.0 Catalogue) h - GSC = USNO-A
2 2 Remark: Detected in the FoV of QX And DSCT R=15.5 mag (The USNO-A2.0 Catalogue) h - USNO-A Date: 13 January 2012 Martignoni, Massimiliano - Stazione Astronomica Betelgeuse, Magnago, Milano, Italy, massimiliano.martignoni@alice.it Remark: UCAC is an EW type eclipsing binary in the field of view of TV Lyn EW (V) d UCAC Date: 20 February 2012 Monninger, G. - Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.v. (BAV), Munsterdamm 90, DE Berlin, Germany, gerold.monninger@online.de Remark: In the field of the high amplitude delta scuti variable (HADS) GSC (this IBVS issue, Monninger, 2011). USNO-B is listed in the Catalogue of SDSS BHB candidates (Smith et al., 2010). A modulation in the light curve was observed RRab (Vmag - GSC2.3) (1) d (1) USNO-B = USNO-A = 2MASS = GSC2.3 N8R Date: 4 June 2012 klaus.bernhard@liwest.at
3 3 Remark: GSC (2MASS J-K = 0.264) has been identified as a double-mode RR Lyrae (RRd) star by analysis of CRTS data (Drake et al., 2009) with 04 (Lenz et al., 2005): frequency (c/d) semi-amplitude (mag) F (first overtone) F (fundamental) F (F1+F2) F (2F2) With a fundamental period of d, the star is near the lower edge of known RRd stars in the Petersen diagram; the ratio F2/F1=0.743 is in agreement with other RRd variables. GSC is RRd (Vmag - GSC) d - GSC = USNO-B = 2MASS J = WISE J = CSS J Date: 12 June 2012 klaus.bernhard@liwest.at Remark: USNO-B (2MASS J-K = 0.119) has been identified as a double-mode RR Lyrae (RRd) star by analysis of CRTS data (Drake et al., 2009) with 04 (Lenz et al., 2005): frequency (c/d) semi-amplitude (mag) F (first overtone) F (fundamental) F (2F1) F (F1+F2) Analysis and folded lightcurves were based on CRTS data from HJD to as the period is possibly variable. With a fundamental period of d, the star is situated in the middle of the Petersen diagram; the ratio F1/F2=0.745 is in agreement with other RRd variables. USNO-B is RRd (Vmag - NOMAD) d - USNO-B = UCAC = 2MASS J = WISE J = CSS J Date: 23 July 2012 Nelson, R.H. - Sylvester Robotic Observatory, Prince George, BC, Canada, bob.nelson@shaw.ca Lubcke, G E Washington Ave, Madison, WI 53703, lubcke@tds.net
4 4 Remark: In the vicinity of V471 Cas EW (R mag = GSC2.3) (2) (12) GSC Date: 15 August 2012 klaus.bernhard@liwest.at Remark: USNO-B (2MASS J-K = 0.193) has been identified as a double-mode RR Lyrae (RRd) star by analysis of CRTS data (Drake et al., 2009) with 04 (Lenz et al., 2005): frequency (c/d) period (d) semi-amplitude (mag) epoch (max) F (first overtone) F (fundamental) With a fundamental period of d, the star is near the lower edge of known RRd stars in the Petersen diagram; the ratio F2/F1= is in agreement with other RRd variables. No linear combination modes could be found in the data. USNO-B is listed in the Catalogue of SDSS BHB candidates (Smith et al., 2010) RRd (CV - CRTS) d - USNO-B = UCAC = 2MASS J = WISE J = CSS J Date: 15 August 2012 klaus.bernhard@liwest.at Remark: GSC (2MASS J-K = 0.225) has been identified as a double-mode RR Lyrae (RRd) star by analysis of CRTS data (Drake et al., 2009) with 04 (Lenz et al., 2005): frequency (c/d) period (d) semi-amplitude (mag) epoch (max) F (first overtone) F (fundamental) With a fundamental period of d, the star is situated in the middle of known RRd stars in the Petersen diagram; the ratio F2/F1=0.745 is in agreement with other RRd variables. No linear combination modes could be found in the data. GSC is listed in the Catalogue of SDSS BHB candidates (Smith et al., 2010).
5 RRd (CV - CRTS) d - GSC = USNO-B = UCAC = 2MASS J = WISE J = CSS J Date: 15 August 2012 Drake, A.J. - Catalina Real-Time Transient Survey Remark: UCAC4 position. J-K=0.216 (2MASS). Rise duration: 39%. USNO-B is RRc (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: UCAC4 position. J-K=0.339 (2MASS). Rise duration: 11%. USNO-B is RRab (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: UCAC4 position. J-K=0.556 (2MASS). Rise duration: 13%. USNO-B is RRab (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: 2MASS position. J-H=0.084 (2MASS; J-H value given as Kmag is flagged as being of bad quality.) Rise duration: 15%. USNO-B is listed in the Catalogue of SDSS BHB candidates (Smith et al., 2010) RRab (CV) d USNO-B = 2MASS J = WISE J = CSS J
6 6 Remark: UCAC4 position. J-K=0.277 (2MASS). Rise duration: 14%. USNO-B is RRab (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: UCAC4 position. J-K=0.291 (2MASS). Rise duration: 13%. USNO-B is RRab (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Date: 14 January 2013 Hümmerich, S. - Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.v. (BAV), Munsterdamm 90, DE Berlin, Germany, ernham@rz-online.de Remark: GSC has been identified as an RRc star by analysis of CRTS data (Drake et al., 2009). UCAC4 position. J K = (2MASS; Skrutskie et al., 2006). Rise duration: 47GSC is RRc (CV) d GSC = USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: USNO-B has been identified as an RRc star by analysis of CRTS data (Drake et al., 2009). UCAC4 position. J K=0.265 (2MASS; Skrutskie et al., 2006). Rise duration: 39USNO-B is RRab (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Remark: USNO-B has been identified as an RRc star by analysis of CRTS data (Drake et al., 2009). UCAC4 position. J K=0.183 (2MASS; Skrutskie et al., 2006). Rise duration: 40USNO-B is
7 RRc (CV) d USNO-B = UCAC = 2MASS J = WISE J = CSS J Date: 7 February 2013 Martignoni, Massimiliano - Stazione Astronomica Betelgeuse, Magnago, Milano, Italy, massimiliano.martignoni@alice.it Remark: TYC is an EA type eclipsing binary in the field of view of DV Mon. It was observed with a 0.25m Schmidt-Cassegrain Telescope (f/10) of the Stazione Astronomica Betelgeuse in Magnago, Italy equipped with a 512x512 pixels Kodak KAF261E CCD cooled to (typ.) -20C; 1.6 arcsec per pixel (1x1 binning); 14 x14 field of view, with a V photometric filter. Reduction to standard photometric system was performed. As comparison and check stars were used UCAC (V=11.47) and UCAC (V=12.79). Using also V magnitude data coming from the All Sky Automated Survey (ASAS), a total of 916 measures were collected. The star shows a secondary minimum approximately at phase EA (V) d TYC = UCAC Date: 25 March 2013 Nelson, R.H Garvin St., Prince George, BC, V2M 3Z1 Canada, bob.nelson@shaw.ca Lubcke, Gil South Avenue, Middleton, Wisconsin, USA, lubcke@tds.net Molnar, Larry - Calvin College, Grand Rapids, MI, , lmolnar@calvin.edlu Remark: Star was discovered to be variable by R.H. Nelson on while observing GSC He obtained a light curve around a primary minimum in R (Cousins). Follow-up data was acquired by G. Lubcke and L. Molnar. The latter discovered the period and obtained a largely full light curve in R (Cousins) with some additional data in V EA B mag = 11.06, V mag = (SIM- BAD) d GSC = TYC = 2MASS J
8 8 Date: 23 August 2013 Srdoc, Gregor - Sarsoni 90 Viskovo, Croatia, gregor@vip.hr Frank, Peter - Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.v. (BAV), Munsterdamm 90, DE Berlin, Germany, frank.velden@t-online.de Klaus.Bernhard@liwest.at Remark: GSC has been discovered as a candidate variable star by investigation of light curves from the SuperWASP public archive (Butters et al., 2010). Follow-up observations by G. Srdoc (V filter; 19 nights; black circles in folded light curve) and P. Frank ( IR filter; 2 nights; grey circles) indicate that GSC is a DSCT variable. J K=0.101 (2MASS; Skrutskie et al., 2006). Positional information was drawn from the UCAC4 catalogue (Zacharias et al., 2013). The difference in mean magnitude between the two datasets results from the use of different filters and telescope systems. The given magnitude range has been derived from G. Srdoc s observations because of the use of a V -filter RRab (CV) d GSC = UCAC = 2MASS Date: 9 September 2013 Nelson, Robert H. - Sylvester Robotic Observatory, Prince George, BC, Canada bob.nelson@shaw.ca Buchheim, Robert - Altimira Observatory (minor planet center observatory code G76) Bob@kbuchheim.org Remark: Minima Determination: Fourier 5-term fit (Nelson), Kwee & van Woerden (both) EA (USNO A2.0: B=15.2, R=13.8) (2) d (6) GSC = USNO A Date: 25 September 2013 Nelson, Robert H. - Sylvester Robotic Observatory, Prince George, BC, Canada bob.nelson@shaw.ca Buchheim, Robert - Altimira Observatory (minor planet center observatory code G76) Bob@kbuchheim.org EB? (USNO A2.0: B=14.5, R=13.1) (1) d (36) GSC = USNO A
9 9 References: Butters, O.W. et al., 2010, A&A, 520L, 10B Drake, A.J. et al., 2009, ApJ, 696, 870 Kwee, K. K., Van Woerden, H., 1956, BAN 12, 327 Lenz, P. et al., 2005, CoAst, 146, 53 Monninger, G., 2011, IBVS, 6100, 1 Skrutskie, M.F. et al., 2006, AJ, 131, 1163 Smith, K.W., Bailer-Jones, C.A.L., Klement, R.J., Xue, X.X., 2010, A&A, 522, A88
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