eprintid: 10090640 rev_number: 16 eprint_status: archive userid: 608 dir: disk0/10/09/06/40 datestamp: 2020-01-28 15:43:11 lastmod: 2021-09-22 22:12:44 status_changed: 2020-01-28 15:43:11 type: article metadata_visibility: show creators_name: Matijevic, G creators_name: Zwitter, T creators_name: Bienayme, O creators_name: Bland-Hawthorn, J creators_name: Boeche, C creators_name: Freeman, KC creators_name: Gibson, BK creators_name: Gilmore, G creators_name: Grebel, EK creators_name: Helmi, A creators_name: Munari, U creators_name: Navarro, J creators_name: Parker, QA creators_name: Reid, W creators_name: Seabroke, G creators_name: Siebert, A creators_name: Siviero, A creators_name: Steinmetz, M creators_name: Watson, FG creators_name: Williams, M creators_name: Wyse, RFG title: EXPLORING THE MORPHOLOGY OF RAVE STELLAR SPECTRA ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. 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. date: 2012-06 date_type: published publisher: IOP PUBLISHING LTD official_url: https://doi.org/10.1088/0067-0049/200/2/14 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 407938 doi: 10.1088/0067-0049/200/2/14 lyricists_name: Seabroke, George lyricists_id: GMSEA14 actors_name: Jayawardana, Anusha actors_id: AJAYA51 actors_role: owner full_text_status: public publication: The Astrophysical Journal Supplement Series volume: 200 number: 2 pages: 14 issn: 1538-4365 citation: Matijevic, G; Zwitter, T; Bienayme, O; Bland-Hawthorn, J; Boeche, C; Freeman, KC; Gibson, BK; ... Wyse, RFG; + view all <#> Matijevic, G; Zwitter, T; Bienayme, O; Bland-Hawthorn, J; Boeche, C; Freeman, KC; Gibson, BK; Gilmore, G; Grebel, EK; Helmi, A; Munari, U; Navarro, J; Parker, QA; Reid, W; Seabroke, G; Siebert, A; Siviero, A; Steinmetz, M; Watson, FG; Williams, M; Wyse, RFG; - view fewer <#> (2012) EXPLORING THE MORPHOLOGY OF RAVE STELLAR SPECTRA. The Astrophysical Journal Supplement Series , 200 (2) 10.1088/0067-0049/200/2/14 <https://doi.org/10.1088/0067-0049%2F200%2F2%2F14>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10090640/1/Seabroke_Matijevi%C4%8D_2012_ApJS_200_14.pdf