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J/ApJ/584/911       X-rays in the Orion nebula cluster       (Feigelson+, 2003)

X-rays in the Orion nebula cluster: constraints on the origins of magnetic activity in pre-main-sequence stars. Feigelson E.D., Gaffney III J.A., Garmire G., Hillenbrand L.A., Townsley L. <Astrophys. J. 584, 911 (2003)> =2003ApJ...584..911F
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources Keywords: open clusters and associations: individual (Orion Nebula Cluster) - stars: activity - stars: magnetic fields - stars: pre-main-sequence - stars: rotation - X-rays: stars Abstract: A recent observation of the Orion Nebula Cluster with the ACIS instrument on board the Chandra X-Ray Observatory detected 1075 sources, 525 of which are pre-main-sequence (PMS) stars with measured bulk properties such as bolometric luminosities, masses, ages, and disk indicators. Nearly half of these stars have photometrically measured rotational periods. This provides a uniquely large and well-defined sample to study the dependence of magnetic activity on bulk properties for stars descending the Hayashi tracks. Description: The ONC was observed with the ACIS-I imaging array on board Chandra twice during the inaugural year of the satellite, on 1999 October 12 and 2000 April 1, for 12 hr on each occasion. The satellite and instrument are described by Weisskopf et al. (2002PASP..114....1W). The reader should consult Feigwlson et al. (2002, Cat. J/ApJ/574/258) for an atlas of the field, full description of the data-reduction procedures, and properties of the 1075 X-ray sources found in the field. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 106 525 X-ray properties of well-characterized ONC stars
See also: J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997) J/ApJ/437/361 : Einstein survey of the Orion nebula region (Gagne+ 1994) J/AJ/121/3160 : JHK photometry near the Trapezium region (Carpenter+, 2001) J/ApJ/574/258 : X-ray-emitting young stars in the Orion nebula (Feigelson+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- CXOONC Chandra X-ray source name (1) 19- 27 A9 --- Name Associated optical star (2) 29- 33 F5.3 [K] logTeff Stellar effective temperature (1) (3) 36- 40 F5.2 [solLum] logLbol Stellar bolometric luminosity (1) (3) 44- 48 F5.2 [solMass] logM Stellar mass (1) (3) 52- 55 F4.2 [yr] logt Stellar age (1) (3) 60- 61 I2 --- DInd [-1/1]? Circumstellar disk indicator 66- 70 F5.2 d Period ? Rotational period (1) 73- 77 A5 --- r_Period Reference for Period (1) (4) 80- 84 F5.2 [---] logRo ? Log Rossby number (5) 88- 91 F4.1 [10-7W] logLs X-ray luminosity (soft band 0.5-2.5keV) (1) 95- 98 F4.1 [10-7W] logLt X-ray luminosity (total band 0.5-8keV) (1) 102-105 F4.1 [---] logLt/Lb Ratio of total-X-ray to bolometric luminosities
Note (1): Obtained from Feigelson et al. (2002, Cat. J/ApJ/574/258); expressed in erg/s. Note (2): Nomenclature note: JW-NNN = JW NNN in Simbad H-NNNN = [H97b] NNNN in Simbad PSH-NN = PSH NN in Simbad Note (3): The temperature, bolometric luminosity, mass and age values were first derived by Hillenbrand, 1997, Cat. J/AJ/113/1733). Note (4): Period references as follows: C = Carpenter et al., 2001, Cat. J/AJ/121/3160 H = Herbst et al., 2000AJ....119..261H, 2001ApJ...554L.197H S = Stassun, 1999, Cat. J/AJ/117/2941 Note (5): The Rossby number is the ratio between the measured rotation period and the convective turnover time.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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