Search Publications
Accurate parameters for HD 209458 and its planet from HST spectrophotometry
del Burgo, C.; Allende Prieto, C.
We present updated parameters for the star HD 209458 and its transiting giant planet. The stellar angular diameter θ = 0.2254 ± 0.0017 mas is obtained from the average ratio between the absolute flux observed with the Hubble Space Telescope and that of the best-fitting Kurucz model atmosphere. This angular diameter represents an improvement in pre…
Distance and extinction determination for APOGEE stars with Bayesian method
Shi, Jianrong; Pan, Kaike; Chen, Bingqiu +3 more
Using a Bayesian technology, we derived distances and extinctions for over 100 000 red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey by taking into account spectroscopic constraints from the APOGEE stellar parameters and photometric constraints from Two Micron All-Sky Survey, as well as a prior …
Measure the distance and extinction for stars in LAMOST survey with Bayesian method
Shi, Jianrong; Zhang, Yong; Wu, Yue +7 more
Using a Bayesian technique, which combines both photometric and spectral information, as well as prior knowledge on the Milky Way, we measured the distance and extinction for about one million stars in the first data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey. Simulations have been performed based on t…
Limb-darkening coefficients from line-blanketed non-LTE hot-star model atmospheres
Howarth, I. D.; Reeve, D. C.
We present grids of limb-darkening coefficients computed from non-local thermodynamic equilibrium (non-LTE), line-blanketed TLUSTY model atmospheres, covering effective-temperature and surface-gravity ranges of 15-55 kK and 4.75 dex (cgs) down to the effective Eddington limit, at 2×, 1×, 0.5× (Large Magellanic Cloud), 0.2× (Small Magellanic Cloud)…
Masses of the components of SB2s observed with Gaia - II. Masses derived from PIONIER interferometric observations for Gaia validation
Mazeh, T.; Grellmann, R.; Tal-Or, L. +15 more
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Spectrograph pour l'Observation des PHénomènes des Intérieurs stellaires et des Exoplanètes (SOPHIE) spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binari…
Chemical compositions and kinematics of the Hercules stream
Lambert, David L.; Reddy, Bacham E.; Ramya, P. +1 more
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…
Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax
Docobo, J. A.; Malkov, O. Yu.; Tamazian, V. S. +2 more
Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as …
Constraining MOND using the vertical motion of stars in the solar neighbourhood
Margalit, Ben; Shaviv, Nir J.
Stars with a different vertical motion relative to the Galactic disc have a different average acceleration. According to modified Newtonian dynamics (MOND) theories, they should therefore have a different average orbital velocity while revolving around the Milky Way. We show that this property can be used to constrain MOND theories by studying sta…