SIMBAD references

2014ApJ...794...36H - Astrophys. J., 794, 36 (2014/October-2)

A spectroscopic census in young stellar regions: the σ Orionis cluster.

HERNANDEZ J., CALVET N., PEREZ A., BRICENO C., OLGUIN L., CONTRERAS M.E., HARTMANN L., ALLEN L., ESPAILLAT C. and HERNAN R.

Abstract (from CDS):

We present a spectroscopic survey of the stellar population of the σ Orionis cluster. We have obtained spectral types for 340 stars. Spectroscopic data for spectral typing come from several spectrographs with similar spectroscopic coverage and resolution. More than half of the stars in our sample are members confirmed by the presence of lithium in absorption, strong Hα in emission or weak gravity-sensitive features. In addition, we have obtained high-resolution (R ∼ 34,000) spectra in the Hα region for 169 stars in the region. Radial velocities were calculated from this data set. The radial velocity distribution for members of the cluster is in agreement with previous work. Analysis of the profile of the Hα line and infrared observations reveals two binary systems or fast rotators that mimic the Hα width expected in stars with accretion disks. On the other hand, there are stars with optically thick disks and narrow Hα profiles not expected in stars with accretion disks. This contribution constitutes the largest homogeneous spectroscopic data set of the σ Orionis cluster to date.

Abstract Copyright:

Journal keyword(s): infrared: stars - open clusters and associations: individual: σ Orionis cluster - protoplanetary disks - stars: formation - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJ/794/36): table1.dat table2.dat table[4-7].dat table9.dat table10.dat>

Status in Simbad:  being processed

Simbad objects: 819

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2020.02.28-14:43:20

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