Abstract
We present the analysis of the stellar content of NGC~2282, a young cluster in the Monoceros constellation, using deep optical $BVI$ and IPHAS photometry along with infrared (IR) data from UKIDSS and $Spitzer$-IRAC. Based on the stellar surface density analysis using nearest neighborhood method, the radius of the cluster is estimated as $\sim$ 3.15$\arcmin$. From optical spectroscopic analysis of 8 bright sources, we have classified three early B-type members in the cluster, which includes, HD 289120, a previously known B2V type star, a Herbig Ae/Be star (B0.5 Ve) and a B5 V star. From spectrophotometric analyses, the distance to the cluster has been estimated as $\sim$ 1.65 kpc. The $K$-band extinction map is estimated using nearest neighborhood technique, and the mean extinction within the cluster area is found to be A$_V$ $\sim$ 3.9 mag. Using IR colour-colour criteria and H$_\alpha$-emission properties, we have identified a total of 152 candidate young stellar objects (YSOs) in the region, of which, 75 are classified as Class II, 9 are Class I YSOs. Our YSO catalog also includes 50 H$_\alpha$-emission line sources, identified using slitless spectroscopy and IPHAS photometry data. Based on the optical and near-IR colour-magnitude diagram analyses, the cluster age has been estimated to be in the range of 2 $-$ 5 Myr, which is in agreement with the estimated age from disc fraction ($\sim$ 58\%). Masses of these YSOs are found to be $\sim$ 0.1$-$2.0 M$_\odot$. Spatial distribution of the candidate YSOs shows spherical morphology, more or less similar to the surface density map.
Highlights
Young embedded stellar clusters are an active star-forming site, where pre-main sequence (PMS) massive and low-mass stars are formed together, and evolved over time-scale of few million years (Lada et al 1994; Lada & Lada 2003)
Three optical sources were classified towards NGC 2282, namely V507 Mon, HD 289120 and EQ 0644.3+0121, of which, V507 Mon was identified as a spectroscopic binary (Wachmann 1996), while HD 289120 as the illuminating source to the reflection nebula (Horner et al 1997)
We have presented multiwavelength studies of a young cluster NGC 2282 in Monoceros constellation, using deep optical
Summary
Young embedded stellar clusters are an active star-forming site, where pre-main sequence (PMS) massive and low-mass stars are formed together, and evolved over time-scale of few million years (Lada et al 1994; Lada & Lada 2003). Uncertain issue of contamination from foreground and background population could be minimized from YSOs excesses at near-infrared (near-IR) and mid-IR wavelengths and observations of close reference field at similar depth (Allen et al 2004; Megeath et al 2004; Flaherty et al 2007) Such contamination could be further narrow down through spectroscopic observations in the optical and near-IR wavelengths We present here multiwavelength studies of the embedded cluster NGC 2282 (α2000 = 06h46m50s.4 δ2000 = +01◦18 50 ), a reflection nebula in the Monoceros constellation It is located in an isolated molecular cloud of few thousand solar masses (Horner, Lada & Lada 1997).
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