Is ESO H-alpha 279 a pre-main sequence binary?

Details Is ESO H-alpha 279 a pre-main sequence binary? Is ESO H-alpha 279 a pre-main sequence binary?

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..165a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 165-174

Astronomy and Astrophysics

Astronomy

10

Binary Stars, Herbig-Haro Objects, Infrared Astronomy, Infrared Imagery, Line Spectra, Pre-Main Sequence Stars, Stellar Magnitude, Visible Spectrum, Color-Color Diagram, Image Analysis, Near Infrared Radiation, Spectral Energy Distribution, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

We present 1-3.4 micrometers near-IR array images of European Southern Observatory (ESO) H-alpha 279, the optical emission line star proposed to be the exciting source of the bipolar Herbig-Haro complex HH106/107 in Serpens. These images show the presence of a close, bright infrared stellar companion to ESO H-alpha 279 located 8.2 arcsec due south. At 2 micrometers, no other sources are seen within approximately 1 arcmin of these stars suggesting that ESO H-alpha 279 and its companion may form a pre-main sequence (PMS) binary. Our NIR photometry has shown that the optical emission line star, ESO H-alpha 279a, is a young, PMS object possessing a strong thermal excess beyond 2 micrometers. Additionally, 2 micrometer spectroscopy has revealed that ESO H-alpha 279a possesses very strong CO bandhead emission from 2.29-2.45 micrometers indicative of the presence of an active accretion disk and/or molecular outflow. The companion source, ESO H-alpha 279b, was found to be extremely red with a J-K approximately 7. Spectroscopy showed that it possesses strong CO bandhead absorption. From both the relative strengths of the dereddened spectral features and evidence provided by the near-IR photometry, we suggest that ESO H-alpha 279b is likely not a PMS companion to ESO H-alpha 279a, but rather it is a highly reddened (Av = 30-40) background M5 III giant. This result emphasizes the extreme care that needs to be taken when using infrared imaging data to study the frequency of binaries amongst PMS stars.

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