The Optical Gravitational Lensing Experiment. Red Clump Stars as a Distance Indicator
, 2000 We present relation of the mean I-band brightness of red clump stars on metallicity. Red clump stars were proposed to be a very attractive standard candle for distance determination.
A. Udalski +6 more
core +1 more source
Rotation in sdB stars as revealed by stellar oscillations
Open Astronomy, 2018 An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane +5 more
doaj +1 more source
Double red giant branch and red clump features of Galactic disc stellar populations with Gaia GSP-Spec [PDF]
Astronomy & AstrophysicsContext. The bimodality of the Milky Way disc, in the form of a thick short disc and a thinner more radially extended one, encrypts the complex internal evolution of our Galaxy and its interaction with the environment. Aims. To disentangle the different competing physical processes at play in Galactic evolution, a detailed chrono-chemical-kinematical ...
A. Recio–Blanco +6 more
openalex +4 more sources
Mass Loss In M67 Giants: Evidence From Isochrone Fitting [PDF]
, 1993 We present a study of the stellar content of the open cluster M67. We have computed new evolutionary sequences of stellar models with solar abundance that cover all phases of evolution from the Zero-Age Main Sequence to the bright end of the Asymptotic ...
Bell, Roger A. +2 more
core +2 more sources
Finding the unusual red giant remnants of cataclysmic variable mergers
The Open Journal of AstrophysicsMergers between helium white dwarfs and main-sequence stars are likely common, producing red giant-like remnants making up roughly a few percent of all low-mass ($\lesssim2M_\odot$) red giants.
Nicholas Z. Rui, Jim Fuller
doaj +1 more source
The origin of the split red clump in the Galactic bulge of the Milky Way [PDF]
, 2012 Near the minor axis of the Galactic bulge, at latitudes b < -5 degrees, the red giant clump stars are split into two components along the line of sight. We investigate this split using the three fields from the ARGOS survey that lie on the minor axis at (
Alves +29 more
core +5 more sources
Li Evolution among Stars of Low/Intermediate Mass: the Metal-deficient Open Cluster NGC 2204
The Astronomical JournalWe have analyzed high-dispersion spectra in the Li 6708 Å region for 167 stars within the anticenter cluster NGC 2204. From 105 probable members, abundance analysis of 45 evolved stars produces [Fe/H] = −0.40 ± 0.12, [Si/Fe] = 0.14 ± 0.12, [Ca/Fe] = 0.29
Barbara J. Anthony-Twarog +4 more
doaj +1 more source
Revisiting the Activity–Rotation Relation for Evolved Stars
The Astrophysical JournalThe magnetic dynamo mechanism of giant stars remains an open question, which can be explored by investigating their activity–rotation relations with multiple proxies. By using the data from the LAMOST and Galaxy Evolution Explorer surveys, we carried out
Henggeng Han +4 more
doaj +1 more source
Radial velocities and membership of stars in the old, distant open cluster Berkeley 29
, 2004 Multi slit spectroscopy at the Telescopio Nazionale Galileo was employed to measure radial velocities for 20 stars in the direction of the old open cluster Berkeley 29, the farthest known in our Galaxy.
A. Bragaglia +25 more
core +1 more source
WFIRST Ultra-Precise Astrometry II: Asteroseismology [PDF]
, 2014 WFIRST microlensing observations will return high-precision parallaxes, sigma(pi) < 0.3 microarcsec, for the roughly 1 million stars with ...
Gould, A. +3 more
core +3 more sources