SIMBAD references

2004AJ....128..787R - Astron. J., 128, 787-804 (2004/August-0)

Chandra X-ray observations of young clusters. II. Orion flanking fields data.

RAMIREZ S.V., REBULL L., STAUFFER J., STROM S., HILLENBRAND L., HEARTY T., KOPAN E.L., PRAVDO S., MAKIDON R. and JONES B.

Abstract (from CDS):

We present results of Chandra observations of two flanking fields (FFs) in Orion, outside the Orion Nebula Cluster (ONC). The observations were taken with the ACIS-I camera with an exposure time of about 48 ks each field. We present a catalog of 417 sources, which includes X-ray luminosity, optical and infrared photometry, and X-ray variability information. We have found 91 variable sources, 33 of which have a flarelike light curve and 11 of which have a pattern of a steady increase or decrease over a 10 hr period. The optical and infrared photometry for the stars identified as X-ray sources are consistent with most of these objects being pre-main-sequence stars with ages younger than 10 Myr. We present evidence for an age difference among the X-ray-selected samples of NGC 2264, Orion FFs, and ONC, with NGC 2264 being the oldest and ONC being the youngest.

Abstract Copyright:

Journal keyword(s): Stars: Activity - Stars: Pre-Main-Sequence - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/AJ/128/787): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Table 1, Col(1): [RRS2004] NOFF WNNN N=203 among (Nos N001 to N256) = Table 1, Col(2): CXORRS JHHMMSS.s+DDMMSS N=203. Table 1, Col(1): [RRS2004] SOFF WNNN N=214 among (Nos S001 to S276) = Table 1, Col(2): CXORRS JHHMMSS.s+DDMMSS N=214.

CDS comments: In tables 4, 5: cross-id. HBJM NNNNN not in SIMBAD.

Simbad objects: 441

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