The near-infrared and ice-band variability of Haro 6-10

• Published in: Astronomy and astrophysics (Berlin) 2001-04, Vol.369 (1), p.215-221
• Main Authors: Leinert, Ch, Beck, T. L., Ligori, S., Simon, M., Woitas, J., Howell, R. R.
• Format: Article
• Language: English
• Subjects: infrared: stars; stars: binaries: close; stars: individual: Haro-10; stars: pre-main sequence; stars: variables: general
• ISSN: 0004-6361; 1432-0746
• DOI: 10.1051/0004-6361:20010111

We have monitored the angularly resolved near infrared and 3.1 μm 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 μm 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 3.5σ and 2.0σ levels, respectively.