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The 21 µm and 30 µm emission features in carbon-rich objects
Volk, Kevin; Sloan, G. C.; Kraemer, Kathleen E.
We review the observational properties and possible carriers of the 21 and 30 µm features seen in the spectra of evolved carbon-rich objects. The 30 µm feature is generally taken to be due to MgS, possibly in combination with other sulfides. It is commonly assumed that the sulfides coat grains of SiC or amorphous carbon, but it remains…
5D memberships and fundamental properties of the old open cluster NGC 6791 based on Gaia
Gao, Xinhua
This paper investigates reliable memberships and fundamental astrophysical properties of the old (∼8 Gyr) open cluster NGC 6791 using the astrometric and photometric data of the Gaia data release 2 (
Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions
Melnik, A. M.; Dambis, A. K.
We calculated the median parallaxes for 47 OB associations including at least 10 stars with known Gaia DR2 parallaxes. A comparison between trigonometric and photometric parallaxes of OB associations reveals a zero-point offset of
A GALEX far-ultraviolet study of quasi-coeval samples of red giants
Smith, Graeme H.; Cochrane, Kevin M.
Samples of red giant branch (RGB) stars have been compiled from the literature for seven moving groups, and searches made for both GALEX FUV and Johnson
Characterizing some Gaia Alerts with LAMOST and SDSS
Liu, X.; Pursimo, T.; Dennefeld, M. +2 more
The ESA-Gaia satellite is regularly producing Alerts on objects where photometric variability has been detected after several passages over the same region of the sky. The physical nature of these objects has often to be determined with the help of complementary observations from ground-based facilities. We have compared the list of Gaia Alerts (f…
HD 54361: evidence for the status of a low mass TP-AGB star
Schmidt, M.; Sperauskas, J.; Začs, L. +3 more
The mass of the cool carbon star HD 54361 was suspected to be high, assuming the membership in the stellar association CMa OB1, in conflict with the theory of stellar evolution. The Gaia parallax and a high-resolution spectrum in the wavelength region from about 4800 to 6900 Å was employed in order to update the distance, atmospheric parameters an…
Exoplanet system Kepler-2 with comparisons to Kepler-1 and 13
Budding, Edwin; Rhodes, Michael D.; Banks, Timothy S. +1 more
We have carried out an intensive study of photometric (Kepler Mission) and spectroscopic data on the system Kepler-2 (HAT-P-7A) using the dedicated software WINFITTER 6.4. The mean individual data-point error of the normalized flux values for this system is 0.00015, leading to the model's specification for the mean reference flux to an accuracy of…