SIMBAD references

2013ApJS..208...28S - Astrophys. J., Suppl. Ser., 208, 28 (2013/October-0)

A new Hα emission-line survey in the Orion Nebula Cluster.

SZEGEDI-ELEK E., KUN M., REIPURTH B., PAL A., BALAZS L.G. and WILLMAN M.

Abstract (from CDS):

We present results from an Hα emission line survey in a 1 deg2 area centered on the Orion Nebula Cluster, obtained with the Wide Field Grism Spectrograph 2 on the 2.2 m telescope of the University of Hawaii. We identified 587 stars with Hα emission, 99 of which, located mainly in the outer regions of the observed area, have not appeared in previous Hα surveys. We determined the equivalent width (EW) of the line and, based on this, classified 372 stars as classical T Tauri stars (CTTSs) and 187 as weak-line T Tauri stars (WTTSs). Simultaneous r', i' photometry indicates a limiting magnitude of r' ∼ 20 mag, but the sample is incomplete at r' > 17 mag. The surface distribution of the Hα emission stars reveals a clustered population and a dispersed population, the former consisting of younger and more massive young stars than the latter. Comparison of the derived EWs with those found in the literature indicates variability of the Hα line. We found that the typical amplitudes of the variability are not greater than a factor of two to three in most cases. We identified a subgroup of low-EW stars with infrared signatures indicative of optically thick accretion disks. We studied the correlations between the EW and other properties of the stars. Based on literature data, we examined several properties of our CTTS and WTTS subsamples and found significant differences in mid-infrared color indices, average rotational periods, and spectral energy distribution characteristics of the subsamples.

Abstract Copyright:

Journal keyword(s): ISM: individual: Orion Nebula Cluster - stars: emission-line, Be - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJS/208/28): table1.dat table2.dat table3.dat>

CDS comments: Table 1:J053422.09-050134.6 is UGCS J053422.09-050134.5; J05344089-0522423 is 2MASS J05344086-0522423; J05344741-0546300 is 2MASS J05344751-0546300; J05345661-0527510 is 2MASS J05345651-0527510; J05351586-0528522 is V* V2277 Ori; J05353852-0509566 is 2MASS J05353862-0509566; J05355040-0528349 is 2MASS J05355043-0528349; J05354356-0508495 is not in 2MASS but seems redundant with J05354354-0508495; J05361049-0519440 is 2MASS J05361049-0519449; J05341351-0535380 and J05341387-0535353 are not in 2MASS and not in SIMBAD. Table 2: J05344244-0543256 is 2MASS J05344244-0543255; J05353041-0534380 is 2MASS J05353041-0534385; J05365073-0537483 is 2MASS J05365073-0537473; J053420.74-053045.9 is UGCS J053420.74-053045.8; J05334964-0536208 and J05342751-0528284 are not in 2MASS and not in SIMBAD.

Simbad objects: 594

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2019.12.12-02:39:35

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