Matijevic, G;
Zwitter, T;
Bienayme, O;
Bland-Hawthorn, J;
Boeche, C;
Freeman, KC;
Gibson, BK;
... Wyse, RFG; + view all
(2012)
EXPLORING THE MORPHOLOGY OF RAVE STELLAR SPECTRA.
The Astrophysical Journal Supplement Series
, 200
(2)
10.1088/0067-0049/200/2/14.
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Abstract
The RAdial Velocity Experiment (RAVE) is a medium-resolution (R ~ 7500) spectroscopic survey of the Milky Way that has already obtained over half a million stellar spectra. They present a randomly selected magnitude-limited sample, so it is important to use a reliable and automated classification scheme that identifies normal single stars and discovers different types of peculiar stars. To this end, we present a morphological classification of ~350, 000 RAVE survey stellar spectra using locally linear embedding, a dimensionality reduction method that enables representing the complex spectral morphology in a low-dimensional projected space while still preserving the properties of the local neighborhoods of spectra. We find that the majority of all spectra in the database (~ 90%-95%) belong to normal single stars, but there is also a significant population of several types of peculiars. Among them, the most populated groups are those of various types of spectroscopic binary and chromospherically active stars. Both of them include several thousands of spectra. Particularly the latter group offers significant further investigation opportunities since activity of stars is a known proxy of stellar ages. Applying the same classification procedure to the sample of normal single stars alone shows that the shape of the projected manifold in two-dimensional space correlates with stellar temperature, surface gravity, and metallicity.
| Type: | Article |
|---|---|
| Title: | EXPLORING THE MORPHOLOGY OF RAVE STELLAR SPECTRA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0067-0049/200/2/14 |
| Publisher version: | https://doi.org/10.1088/0067-0049/200/2/14 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10090640 |
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