Published January 1, 2011 | Version v1
Journal article Open

SDSS J162520.29+120308.7-a new SU Ursae Majoris star in the period gap

Creators

  • 1. Nicolaus Copernicus Astron Ctr, PL-00176 Warsaw, Poland
  • 2. Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA
  • 3. TUBITAK Natl Observ, TR-07058 Antalya, Turkey
  • 4. Brno Univ Technol, Inst Comp Sci, Fac Civil Engn, Brno 60200, Czech Republic
  • 5. Virtual Telescope Project, I-03023 Ceccano, FR, Italy
  • 6. Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA
  • 7. Ctr Backyard Astrophys Pukekohe, Pukekohe, New Zealand
  • 8. Amer Assoc Variable Star Observers, Cambridge, MA 02138 USA
  • 9. British Astron Assoc, Variable Star Sect BAA VSS, London W1J 0DU, England
  • 10. Antelope Hills Observ, Ctr Backyard Astrophys Colorado, Bennett, CO 80102 USA
  • 11. Columbia Univ, Dept Astron, New York, NY 10027 USA

Description

We report results of an extensive world-wide observing campaign devoted to the recently discovered dwarf nova SDSS J162520.29+120308.7 (SDSS J1625). The data were obtained during the July 2010 eruption of the star and in August and September 2010 when the object was in quiescence. During the July 2010 superoutburst, SDSS J1625 clearly displayed superhumps with a mean period of P-sh = 0.095942(17) days (138.16 +/- 0.02 min) and a maximum amplitude reaching almost 0.4 mag. The superhump period was not stable, decreasing very rapidly at a rate of. P = -1.63(14) x 10(-3) at the beginning of the superoutburst and increasing at a rate of. P = 2.81(20) x 10(-4) in the middle phase. At the end of the superoutburst, it stabilized around the value of P-sh = 0.09531(5) day.

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