• DOI:10.1088/0004-637X/813/2/107
• Corpus ID: 118492260

PERIODIC ACCRETION INSTABILITIES IN THE PROTOSTAR L1634 IRS 7

@article{Hodapp2015PERIODICAI,
  title={PERIODIC ACCRETION INSTABILITIES IN THE PROTOSTAR L1634 IRS 7},
  author={Klaus W. Hodapp and Rolf Chini},
  journal={The Astrophysical Journal},
  year={2015},
  volume={813}
}

• K. Hodapp, R. Chini
• Published 1 October 2015
• Physics
• The Astrophysical Journal

The small molecular cloud Lynds 1634 contains at least three outflow sources. We found one of these, IRS 7, to be variable with a period of 37.14 ± 0.04 days and an amplitude of approximately 2 mag in the Ks band. The light curve consists of a quiescent phase with little or no variation, and a rapid outburst phase. During the outburst phase, the rapid variation in brightness generates light echoes that propagate into the surrounding molecular cloud, allowing a measurement of the distance to IRS 7 of 404 pc ± 35 pc. We observed only a marginally significant change in the H − K color during the outburst phase. The K-band spectrum of IRS 7 shows CO bandhead emission but its equivalent width does not change significantly with the phase of the light curve. The H2 1–0 S(1) line emission does not follow the variability of the continuum flux. We also used the imaging data for a proper motion study of the outflows originating from the IRS 7 and the far-infrared source IRAS 05173-0555, and confirm that these are indeed distinct outflows.