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Title: | An upper limit on the ratio between the extreme ultraviolet and the bolometric luminosities of stars hosting habitable planets |
Authors: | Sengupta, S |
Keywords: | Hydrodynamics Planetary systems stars Earth: atmosphere |
Issue Date: | Jul-2016 |
Publisher: | Indian Academy of Sciences |
Citation: | Journal Astrophysics and Astronomy, Vo. 37, No. 2, 11 |
Abstract: | An abundance analysis is reported of 58-K giants identified by Famaey et al. ( 2005 , A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hipparcos catalogue. The giants have compositions spanning the interval [Fe/H] from − 0.17 to + 0.42 with a mean value of + 0.15 and relative elemental abundances [El/Fe] representative of the Galactic thin disc. Selection effects may have biased the selection from the Hipparcos catalogue against the selection of metal-poor stars. Our reconsideration of the recent extensive survey by Bensby et al. of FG dwarfs, including metal- poor stars, provides a [Fe/H] distribution for the Hercules stream, which is similar to that from the 58 giants. It appears that the stream is dominated by metal-rich stars from the thin disc. We discuss suggestions in the literature that the stream includes metal-poor stars from the thick disc. |
Description: | Restricted Access © Indian Academy of Sciences http://dx.doi.org/10.1007/s12036-016-9390-0 |
URI: | http://prints.iiap.res.in/handle/2248/7244 |
ISSN: | 0250-6335 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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An upper limit on the ratio between the extreme ultraviolet and the bolometric luminosities of stars hosting habitable planets.pdf | Restricted Access | 185.43 kB | Adobe PDF | View/Open |
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