Vertical distribution of Galactic disk stars , IV. AMR and AVR from clump giants

By C. Soubiran, O. Bienaymé, T. Mishenina, V. V. K. L. D. D. Bordeaux, O. Strasbourg, O. Observatory. 2007

137 citations recorded by the source corpus.

We present the parameters of 891 stars, mostly clump giants, including atmospheric parameters, distances, absolute magnitudes, spatial velocities, galactic orbits and ages. One part of this sample consists of local giants, within 100 pc, with atmospheric parameters either estimated from our spectroscopic observations at high resolution and high signal-to-noise ratio, or retrieved from the literature. The other part of the sample includes 523 distant stars, spanning distances up to 1 kpc in the direction of the North Galactic Pole, for which we have estimated atmospheric parameters from high resolution but low signal-to-noise Echelle spectra. This new sample is kinematically unbiased, with well-defined boundaries in magnitude and colours. We revisit the basic properties of the Galactic thin disk as traced by clump giants. We find the metallicity distribution to be different from that of dwarfs, with fewer metal-rich stars. We find evidence for a vertical metallicity gradient of –0.31 dex kpc -1 and for a transition at ~4–5 Gyr in both the metallicity and velocities. The age–metallicity relation (AMR), which exhibits a very low dispersion, increases smoothly from 10 to 4 Gyr, with a steeper increase for younger stars. The age–velocity relation (AVR) is characterized by the saturation of the V and W dispersions at 5 Gyr, and continuous heating in U .

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/dd7318ee0cadb7f62461ffb946f99b33582c9ba9

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Instrumentation

Citations in the corpus

Vertical disc heating in Milky Way-sized galaxies in a cosmological context (2015, background): “…the relation may saturate at ages of ∼ 5 Gyr (Dehnen & Binney 1998; Aumer & Binney 2009), or that there is a jump in velocity dispersion ∼ 8− 9 Gyr ago (Soubiran et al. 2008). mechanisms for radial migration, such as migration induced by spiral-bar coupling (Minchev & Famaey 2010), wave mode…”
INSIDE OUT AND UPSIDE DOWN: TRACING THE ASSEMBLY OF A SIMULATED DISK GALAXY USING MONO-AGE STELLAR POPULATIONS (2013, methodology): “…in studies based on the Geneva Copenhagen Survey in the MW (Holmberg et al. 2007; Casagrande et al. 2011), though some explorations of smaller data sets find a plateau in the age-velocity relationship for stars of intermediatege (e.g., Wielen 1977; Quillen & Garnett 2001; Soubiran et al. 2008).”
AN ANCIENT EXTRASOLAR SYSTEM WITH FIVE SUB-EARTH-SIZE PLANETS (2015, background): “Kepler-444 is also iron-poor, as described by a number of independent studies providing atmospheric parameter estimates based on high-resolution spectroscopy (Peterson 1980; Tomkin & Lambert 1999; Soubiran et al. 2008; Sozzetti et al. 2009; Ramya et al. 2012).”
Through thick and thin: kinematic and chemical components in the solar neighbourhood (2010, background): “3 disfavours such gradual heating; if present, the heating mechanism must operate promptly and saturate quickly, as has been suggested in the past (Strömgren 1987; Freeman 1991; Quillen & Garnett 2000; Soubiran et al. 2008).”
THE LONG-TERM EVOLUTION OF THE GALACTIC DISK TRACED BY DISSOLVING STAR CLUSTERS (2010, background): “The axis ratios are roughly constant as a function of stellar age but the volume of the ellipsoid grows with time, at least for a few Gyr (Soubiran et al 2008; cf. Aumer & Binney 2009).”
XHIP: An extended hipparcos compilation (2011, unknown): “IV, Soubiran et al., 2008.”
New constraints on the chemical evolution of the solar neighbourhood and galactic disc(s) - improved astrophysical parameters for the Geneva-Copenhagen Survey (2011, background): “…samples, many investigations (e.g., Feltzing & Gustafsson 1998; Bensby et al. 2003; Reddy et al. 2006; Bensby et al. 2007; Ramı́rez et al. 2007; Soubiran et al. 2008) make use of sophisticated kinematic selections to achieve significant numbers of members belonging to different…”
Metallicity gradients in disks - Do galaxies form inside-out? (2012, background): “(2005, 2006) and Soubiran et al. (2008), and soon-to-be-releas d work using SDSS-SEGUE and RAVE datasets, show that verti- cal metallicity profiles can provide extremely eff ctive tools for separating the thin disk from the thick disk.”
Coudé-feed stellar spectral library – atmospheric parameters (2010, methodology): “This star is one of the absolute calibrators in Soubiran et al. (2008), who adopted an average between the measurements by Luck (1982), Smith & Lambert (1987) and Mallik (1998).”
ULySS: a full spectrum fitting package (2009, unknown): “– References — (1) Takada(1977); (2) Venn (1995); (3) Takeda (2007); (4) Soubiran et al.(2008); (5) Luck & Bond (1980).”