HD 101088, AN ACCRETING 14 AU BINARY IN LOWER CENTAURUS CRUX WITH VERY LITTLE CIRCUMSTELLAR DUST

Journal Article · Mon May 10 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/714/2/1542· OSTI ID:21448824

Bitner, Martin A; Chen, Christine H; Muzerolle, James ^[1]; Weinberger, Alycia J ^[2]; Pecaut, Mark; Mamajek, Eric E ^[3]

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1. Space Telescope Science Institute, Baltimore, MD 21218-2463 (United States)
2. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015-1305 (United States)
3. University of Rochester, Department of Physics and Astronomy, Rochester, NY 14627-0171 (United States)

We present high-resolution (R = 55, 000) optical spectra obtained with MIKE on the 6.5 m Magellan Clay Telescope as well as Spitzer MIPS photometry and Infrared Spectrometer low-resolution (R {approx} 60) spectroscopy of the close (14 AU separation) binary, HD 101088, a member of the {approx}12 Myr old southern region of the Lower Centaurus Crux subgroup of the Scorpius-Centaurus OB association. We find that the primary and/or secondary is accreting from a tenuous circumprimary and/or circumsecondary disk despite the apparent lack of a massive circumbinary disk. We estimate a lower limit to the accretion rate of M-dot > 1x10{sup -9} M{sub sun} yr{sup -1}, which our multiple observation epochs show varies over a timescale of months. The upper limit on the 70 {mu}m flux allows us to place an upper limit on the mass of dust grains smaller than several microns present in a circumbinary disk of 0.16 M{sub moon}. We conclude that the classification of disks into either protoplanetary or debris disks based on fractional infrared luminosity alone may be misleading.

• OSTI ID: 21448824
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 714; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DUSTS
INFRARED SPECTROMETERS
LUMINOSITY
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
PROTOPLANETS
SPECTROMETERS
SPECTROSCOPY
STARS
TELESCOPES