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Discovery of a Transiting Planet and Eight Eclipsing Binaries in HATNet Field G205
We report the discovery of HAT-P-8b, a transiting planet with mass Mp = 1.52+0.18 -0.16 MJ, radius R p = 1.50+0.08-0.06 R J, and photometric period P = 3.076days. HAT-P-8b has a somewhat inflated radius for its mass, and asomewhat large mass for its period. The host star is a solar-metallicityF dwarf, with mass M sstarf = 1.28 ± 0.04 Msun and R sstarf = 1.58+0.08-0.06 R sun. HAT-P-8b was initiallyidentified as one of the 32 transiting-planet candidates in HATNet fieldG205. We describe the procedures that we have used to follow up thesecandidates with spectroscopic and photometric observations, and wepresent a status report on our interpretation for 28 of the candidates.Eight are eclipsing binaries with orbital solutions whose periods areconsistent with their photometric ephemerides; two of thesespectroscopic orbits are single-lined and six are double-lined.Based in part on observations obtained at the W. M. Keck Observatory,which is operated by the University of California and the CaliforniaInstitute of Technology. Keck time has been granted by NOAO (A285Hr).
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A search for Lambda Bootis stars in two OB associations, Orion OB1 andLacerta OB1, has been carried out. One Lambda Bootis star has beendiscovered in the Orion OB1 association. In addition, nine A-type starswhich appear to be slightly metal weak have been found in the twoassociations. The Lambda Bootis star is situated on the Zero-Age MainSequence (ZAMS). The discovery of these stars strengthens the hypothesisthat the Lambda Bootis stars are related to a short-lived evolutionaryphase associated with the arrival of the star on the ZAMS.
| Spectral classification of stars in Lac OB1
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976AJ.....81.1120G&db_key=AST
| Hβ Photometry for the Association i Lacertae.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Lacerta |
| Ascensió Recta: | 22h41m46.78s |
| Declinació: | +36°49'28.1" |
| Magnitud Aparent: | 10.201 |
| Moviment propi RA: | -2.2 |
| Moviment propi Dec: | -9.1 |
| B-T magnitude: | 10.401 |
| V-T magnitude: | 10.218 |
Catàlegs i designacions:
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