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ORIYSOIR - Orion Nebula YSO IR Properties

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Overview

The origin and evolution of the X-ray emission in very young stellar objects (YSOs) are not yet well understood because it is very hard to observe YSOs in the protostellar phase. Using COUP data, the authors studied in their reference paper the X-ray properties of stars in the Orion Nebula Cluster (ONC) in different evolutionary classes: luminosities, hydrogen column densities NH, effective plasma temperatures, and time variability were compared to understand if the interaction between the circumstellar material and the central object can influence the X-ray emission. They have assembled the deepest and most complete photometric catalog of objects in the ONC region from the UV to 8 microns (um) using data from the HST Treasury Program; deep and almost simultaneous UBVI and JHK images taken, respectively, with WFI at ESO 2.2m and ISPI at CTIO 4m telescopes; and Spitzer IRAC imaging. They selected high-probability candidate Class 0-I protostars, a sample of "bona fide" Class II stars, and a set of Class III stars with IR emission consistent with normal photospheres. Their principal result is that Class 0-Ia objects are significantly less luminous in X-rays, in both the total and hard bands, than the more evolved Class II stars with mass larger than 0.5M_{sun}_; the latter show X-ray luminosities similar to those of Class 0-Ib stars.

This table contains the JHK and IRAC data, as well as the protostar classifications, for 398 ONC YSOs.


Catalog Bibcode

2008ApJ...677..401P

References

X-ray properties of protostars in the Orion nebula.
    Prisinzano L., Micela G., Flaccomio E., Stauffer J.R., Megeath T.,
    Rebull L., Robberto M., Smith K., Feigelson E.D., Grosso N., Wolk S.
   <Astrophys. J., 677, 401-424 (2008)>
   =2008ApJ...677..401P    (SIMBAD/NED BibCode)

Provenance

This online catalog was created by the HEASARC in October 2010 based on the machine-readable versions of Tables 2, 3, 4 and 5 from the reference paper which were obtained from the CDS (their catalog J/ApJ/677/401).

Parameters

Source_Number
A unique identification number for each YSO in the catalog.

Coup_Number
The COUP (Getman et al. 2005, ApJS, 160, 319) identification number of the X-ray counterpart of the YSO.

Name
The source designation for YSOs in this table as recommended by the Dictionary of Nomenclature of Celestial Objects, i.e., '[PMF2008] n' where the prefix is the reference paper (Prisinzano, Micela, Flaccomio 2008) and n is the source number.

RA
The Right Ascension of the YSO in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-7 degrees in the original table.

Dec
The Declination of the YSO in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-7 degrees in the original table.

LII
The Galactic Longitude of the YSO.

BII
The Galactic Latitude of the YSO.

Jmag
The J-band magnitude of the YSO taken from the sources discussed in Section 2.3 of the reference paper.

Jmag_Error
The uncertainty in the J-band magnitude.

Hmag
The H-band magnitude of the YSO taken from the sources discussed in Section 2.3 of the reference paper.

Hmag_Error
The uncertainty in the H-band magnitude.

Kmag
The K-band magnitude of the YSO taken from the sources discussed in Section 2.3 of the reference paper.

Kmag_Error
The uncertainty in the K-band magnitude.

IRAC_3p6_um_Mag
The Spitzer/IRAC 3.6-micron band magnitude of the YSO. Details on the IRAC data are given in Section 2.4 of the reference paper.

IRAC_3p6_um_Mag_Error
The uncertainty in the 3.6-micron band magnitude of the YSO.

IRAC_4p5_um_Mag
The Spitzer/IRAC 4.5-micron band magnitude of the YSO. Details on the IRAC data are given in Section 2.4 of the reference paper.

IRAC_4p5_um_Mag_Error
The uncertainty in the 4.5-micron band magnitude of the YSO.

IRAC_5p8_um_Mag
The Spitzer/IRAC 5.8-micron band magnitude of the YSO. Details on the IRAC data are given in Section 2.4 of the reference paper.

IRAC_5p8_um_Mag_Error
The uncertainty in the 5.8-micron band magnitude of the YSO.

IRAC_8p0_um_Mag
The Spitzer/IRAC 8.0-micron band magnitude of the YSO. Details on the IRAC data are given in Section 2.4 of the reference paper.

IRAC_8p0_um_Mag_Error
The uncertainty in the 8.0-micron band magnitude of the YSO.

Source_Sample
This parameter indicates the YSO classification, e.g., '0/Ia' for a 0/Ia protostar candidate (listed in Table 2 of the reference paper), '0/Ib' for a 0/Ib protostar candidate (listed in Table 3 of the reference paper), 'II' for a class II (classical T Tauri star) candidate (listed in Table 4 of the reference paper), and 'III' for a class III (weak-lined T Tauri star) candidate (listed in Table 5 of the reference paper). Full details of the YSO classification scheme are given in Section 3 of the reference paper.

Class
The HEASARC Browse object classification, based on the classification specified in the source_sample parameter. Because of its relative crudeness compared to the latter, all sources with source_sample values of '0/Ia' and '0/Ib' have been given class values corresponding to Type I protostars, notice.


Contact Person

Questions regarding the ORIYSOIR database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 5-Oct-2010