EDP Sciences
Free access
Volume 369, Number 1, April I 2001
Page(s) 215 - 221
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010111

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. Howell4

1  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)

We have monitored the angularly resolved near infrared and 3.1 $\mu$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 $\mu$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$\sigma$ and 2.0$\sigma$ 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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