On the Nature of V2282 Sgr
Abstract
The star V2282 Sgr is positionally consistent with a strong Chandra X-ray and a Spitzer/IRAC mid-infrared source. We derived its long-term I-band light curve from the photographic archives of the Asiago and Catania Observatories, covering the years from 1965 to 1984. Also, CCD R_C photometry of 2009 was re-analyzed. Optical spectra were collected at the Loiano Observatory in 2011 and 2012. J,H,Ks photometry, obtained from several sources in different epochs was compared and the Spitzer images were re-analyzed. V2282 Sgr was found to be an irregular variable in all wavelengths. Spectroscopically, it shows strong emission features (H Balmer lines, [N II] 6584 Å and [O III] 5007/4959Å) while the Na I D-doublet is very strong, indicating a circumstellar envelope. A single thermal energy distribution cannot reproduce the observed SED, while it can be explained as the sum of a G-type star plus a variable circumstellar disk, which mimics YSO of class 0/I. Most likely, V2282 Sgr is a 1-2 M_{⊙} mass pre-main-sequence star with an accretion disk.
- Publication:
-
Baltic Astronomy
- Pub Date:
- 2013
- DOI:
- 10.1515/astro-2017-0159
- arXiv:
- arXiv:1312.0085
- Bibcode:
- 2013BaltA..22..259N
- Keywords:
-
- stars: pre-main-sequence;
- protostars;
- variables: T Tauri: individual (V2282 Sgr);
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 13 pages, 7 figure, in press on Baltic Astronomy