First-overtone co variability in young stellar objects

Ana M. Biscaya, G. H. Rieke, Gopal Narayanan, K. L. Luhman, E. T. Young

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

We have monitored the 2.3 μm Δν = 2 CO bands toward young stellar objects that are predominantly of low luminosity (L < 10,000 L) and show evidence of mass loss. The CO emission can be highly variable, on timescales as short as a few days. In DG Tau, the bands have been observed to disappear and reappear and may also have a periodic modulation. For the BN object, the equivalent width has varied by a factor of 3; and for VI331 Cyg, the equivalent width doubled in 9 days. Changes in equivalent width also occurred in SSV 13, AS 353A, and 1548C27, while WL 16 and S106 have not shown variations. Of the nine CO absorption sources reobserved, only the FU Ori-type star V1057 Cyg went through a significant change in equivalent width. It also presents an unusual and variable band profile.

Original languageEnglish (US)
Pages (from-to)359-365
Number of pages7
JournalAstrophysical Journal
Volume491
Issue number1 PART I
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Keywords

  • Infrared: stars
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Biscaya, A. M., Rieke, G. H., Narayanan, G., Luhman, K. L., & Young, E. T. (1997). First-overtone co variability in young stellar objects. Astrophysical Journal, 491(1 PART I), 359-365. https://doi.org/10.1086/304935