Is LkH alpha 264 like a young, extremely active Sun?

Citation
Vm. Costa et al., Is LkH alpha 264 like a young, extremely active Sun?, M NOT R AST, 307(3), 1999, pp. L23-L26
Citations number
14
Categorie Soggetti
Space Sciences
Journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN journal
00358711 → ACNP
Volume
307
Issue
3
Year of publication
1999
Pages
L23 - L26
Database
ISI
SICI code
0035-8711(19990811)307:3<L23:ILA2LA>2.0.ZU;2-S
Abstract
We combine calibrated International Ultraviolet Explorer (IUE) archive data and new low-resolution optical data for the T Tauri star LkH alpha 264 cov ering the region from 1200 to 7000 Angstrom. The UV continuum is well fitte d by the combination of a blackbody at 4300 K plus hydrogenic free-free and free-bound emission from a dense plasma at 3.5 x 10(4) K plus the emission by a second blackbody. This last component is at T approximate to 8700 K a nd covers about 4 per cent of the stellar surface. We interpret this last c omponent to be the result of emission from one or various hotspots. The int eresting result is that this combined emission also fits the observed optic al continuum well. We conclude that this star is an analogue of the Sun, ho wever displaying a much higher level of activity.