[vsnet-newvar 1704] GSC 5142-2355 is a Mira-type Variable Star

["James Bedient" <bedient@hawaii.rr.com>]

GSC 5142-2355 is a Mira-type Variable Star

Position (J2000): 19h 20m 29.96s -07 deg. 02' 40.0"

Cross-Identifications:
USNO A2.0 0825-15406327
2MASSI J1920299-070239
IRAS 19177-0708
StM 470

Chad Nishizuka (then at Kailua High School, Hawaii; now at the Illinois
Institute of Technology) first noted this star's variability while blinking
Stardial (McCullough and Thakkar 1997) images. Further data was extracted from
Stardial imagery by Julius Paulo (Waipahu High School, Hawaii) and Kathleen
Warren (Sacred Hearts Academy, Hawaii).

The star exhibits an amplitude of 2.0 (plus or minus 0.2) magnitudes in red
light, and a period of 190 days. The USNO A2.0 catalogue (Monet et al. 1998)
records magnitudes m_B=13.9 and m_R=10.8.  The star was detected by IRAS and a
low-resolution spectrum obtained (IRAS team, 1987). The star is very bright in
the infrared.  The star's image is saturated in 2MASS J, H and Ks data.
Stephenson (1986) found a spectral type of M7.

A 15'x 15' finder chart, light curve, and the IRAS low-res spectrum can be
viewed at:

http://vsnet2.hawaii.edu/~bedient/nishizuka.html

Acknowledgements:

This research has made use of NASA's Astrophysics Data System Bibliographic
Services, and the VizieR catalogue access tool, CDS, Strasbourg, France.

The Digitized Sky Surveys were produced at the Space Telescope Science
Institute under U.S. Government grant NAG W-2166. The images of these surveys
are based on photographic data obtained using the Oschin Schmidt Telescope on
Palomar Mountain and the UK Schmidt Telescope. The plates were processed into
the present compressed digital form with the permission of these institutions.

This publication makes use of data products from the Two Micron All Sky
Survey, which is a joint project of the University of Massachusetts and the
Infrared Processing and Analysis Center/California Institute of Technology,
funded by the National Aeronautics and Space Administration and the National
Science Foundation.

References:

IRAS Team, 1987, IRAS Low Resolution Spectra (LRS). NASA RP-1190

McCullough, P.; Thakkar, U., 1997, PASP 109, 1264

Monet D., Bird A., Canzian B., Dahn C., Guetter H., Harris H., Henden A.,
Levine S., Luginbuhl C., Monet A.K.B., Rhodes A., Riepe B., Sell S., Stone R.,
Vrba F., Walker R., 1998, USNO-A V2.0, A Catalog of Astrometric Standards, US
Naval Observatory Flagstaff Station

Stephenson, C. B., 1986, Astrophys. J., 301, 927-937

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