Abstract
The nature of V2282 Sgr is examined on the basis of several multiband observations: a 20 years long I-band light curve of V2282 Sgr obtained from archive photographic plates of the Asiago and Catania Observatories; a CCD R-band light curve obtained at Cornero Observatory; JHK photometry from 2MASS and UKDISS; <em>Spitzer</em> IRAC and MIPS images; optical spectra from Loiano Observatory; X-ray flux from <em>CHANDRA</em>. The star has a K-type spectrum with strong emission lines and is irregularly variable at all wavebands. The overall evidences suggest that V2282 Sgr is a Pre Main Sequence star with an accretion disk.
Highlights
The M20 (Trifid) nebula is a spectacular star forming region of the Milky Way: it is projected in the sky over the open star cluster NGC 6514, and its distance has been estimated by several authors, ranging from 1.4 kpc [6] up to 2.7 kpc [1]
The nature of V2282 Sgr is examined on the basis of several multiband observations: a 20 years long I-band light curve of V2282 Sgr obtained from archive photographic plates of the Asiago and Catania Observatories; a CCD R-band light curve obtained at Cornero Observatory; JHK photometry from 2MASS and UKDISS; Spitzer IRAC and MIPS images; optical spectra from Loiano Observatory; X-ray flux from CHANDRA
The overall evidences suggest that V2282 Sgr is a Pre Main Sequence star with an accretion disk
Summary
The M20 (Trifid) nebula is a spectacular star forming region of the Milky Way: it is projected in the sky over the open star cluster NGC 6514, and its distance has been estimated by several authors, ranging from 1.4 kpc [6] up to 2.7 kpc [1]. A nebular variable (either of the T Tau, RW Aur or T Ori type) is believed to be a Pre Main Sequence (PMS) star already partially clear of its originating circumstellar envelope [2]: this seems at odds with classification as a Class I/0 object, which is a still deeply embedded source. For this reason we decided to explore in more detail its nature. The rms deviation of the values of N magnitude for V2282 Sgr was 0.25 mag in the Asiago and 0.34 mag in the Catania datasets, substantially larger than the faintest comparison star.
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