The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf
| dc.creator | Cushing, Michael C. | |
| dc.creator | Vacca, William D. | |
| dc.date | 2005-11-14 | |
| dc.date.accessioned | 2026-07-07T11:24:57Z | |
| dc.date.available | 2026-07-07T11:24:57Z | |
| dc.description | We present a moderate resolution (R=2000), 0.8-4.1 micron spectrum of LSR 1610-0040, a high proper motion star classified as an early-type L subdwarf by Lepine and collaborators based on its red-optical spectrum. The near-infrared spectrum of LSR 1610-0040 does not fit into the (tentative) M/L subdwarf sequence but rather exhibits a mix of characteristics found in the spectra of both M dwarfs and M subdwarfs. In particular, the near-infrared spectrum exhibits a Na I doublet and CO overtone bandheads in the K band, and Al I and K I lines and an FeH bandhead in the H band, all of which have strengths more typical of field M dwarfs. Furthermore the spectrum of Gl 406 (M6 V) provides a reasonably good match to the 0.6-4.1 micron spectral energy distribution of LSR 1610. Nevertheless the near-infrared spectrum of LSR 1610 also exhibits features common to the spectra of M subdwarfs including a strong Ti I multiplet centered at ~0.97 microns, a weak VO band at ~1.06 microns, and possible collision-induced H_2 absorption in the H and K bands. We discuss a number of possible explanations for the appearance of the red-optical and near-infrared spectrum of LSR 1610-0040. Although we are unable to definitively classify LSR 1610-0040, the preponderance of evidence suggests that it is a mildly metal-poor M dwarf. Finally, we tentatively identify a new band of TiO at ~0.93 microns in the spectra of M dwarfs. | |
| dc.description | Accepted for publication in the Astronomical Journal | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0511398 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0511398 | |
| dc.identifier | Astron.J.131:1797-1805,2006 | |
| dc.identifier | doi:10.1086/499583 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195368 | |
| dc.subject | Astrophysics | |
| dc.title | The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf | |
| dc.type | text |