Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-12
Astronomy and Astrophysics
Astrophysics
21 pages, 17 figures; accepted for publication in ApJ - correction of unit label in Table 2
Scientific paper
10.1086/526421
We report the results of our HST snapshot survey with the ACS HRC PR200L prism, designed to measure the near-UV emission in a sample of nearby M dwarfs. 33 stars were observed, spanning the mass range from 0.1 - 0.6 solar masses (T_eff ~ 2200K - 4000K) where the UV energy distributions vary widely between active and inactive stars. These observations provide much-needed constraints on models of the habitability zone and the atmospheres of possible terrestrial planets orbiting M dwarf hosts, and will be useful in refining the target selection for future space missions such as TPF. We compare our data with a new generation of M dwarf atmospheric models and discuss their implication for the chromospheric energy budget. These NUV data will also be valuable in conjunction with existing optical, FUV and X-ray data to explore unanswered questions regarding the dynamo generation and magnetic heating in low-mass stars.
Hawley Suzanne L.
Johns-Krull Christopher M.
Walkowicz Lucianne M.
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