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A&A 369, 215-221 (2001)
DOI: 10.1051/0004-6361:20010111
The near-infrared and ice-band variability of Haro 6-10
Ch. Leinert1, T. L. Beck2, 3, S. Ligori1, M. Simon2, 3, J. Woitas1 and R. R. Howell41 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
2 State University of New York at Stony Brook, Stony Brook, NY 11974-3800, USA
3 Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under contract to the National Aeronautics and Space Administration
4 University of Wyoming, Laramie, WY 82071, USA
(Received 1 December 2000 / Accepted 19 January 2001)
Abstract
We have monitored the angularly resolved near infrared and 3.1 
m
ice-band flux of the components of the young binary Haro 6-10 on 23 occasions
during the years 1988 to 2000. Our observations reveal that both
the visible star Haro 6-10
(Haro 6-10S) and its infrared companion (Haro 6-10N) show significant
variation in flux on time scales as short as a month.
The substantial
flux decrease of Haro 6-10S over the last four years carries the
reddening signature of increased extinction. However, a comparable K-band flux increase observed in the IRC is associated with a dimming in the H-band and cannot be explained by lower extinction. Absorption in the
3.1 m water-ice feature was always
greater towards the IRC during our observations, indicating a larger amount of obscuring material along its line of sight.
We detect variability in the ice-band absorption towards Haro 6-10S and Haro 6-10N, significant at the 3.5
and 2.0
levels, respectively.
Key words: stars: binaries: close -- infrared: stars -- stars: individual: Haro-10 -- stars: pre-main sequence -- stars: variables: general
Offprint request: Ch. Leinert, leinert@mpia-hd.mpg.de
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