J/A+A/463/275 Chandra obs. of Serpens star-forming region (Giardino+, 2007)
The onset of X-ray emission in young stellar objects. A Chandra observation of the Serpens star-forming region. Giardino G., Favata F., Micela G., Sciortino S., Winston E. <Astron. Astrophys., 463, 275-288 (2007)> =2007A&A...463..275G
ADC_Keywords: Associations, stellar ; YSOs ; Stars, pre-main sequence ; X-ray sources Keywords: ISM: clouds - ISM: individual objects: Serpens cloud - stars: pre-main sequence - X-rays: stars Abstract: To study the properties of X-ray emission from young stellar objects (YSOs) through their evolution from Class I to Class III and determine whether Class 0 protostars emit X-rays. A deep Chandra X-ray observation of the Serpens star-forming region was obtained. The Serpens Cloud Core is ideally suited for this type of investigation, being populated by a dense and extremely young cluster whose members are found in all evolutionary stages, including six well-studied Class 0 sources. Description: The core of the Serpens cloud was observed with Chandra starting at 21:43 UT on June 19, 2004. The observation lasted for 91.4ks (although the scheduled duration was 100ks). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 95 85 X-ray sources detected with PWDETECT in the Chandra observation of the Serpens star forming region. table6.dat 107 51 The cross-identification of the sources below was obtained from the Simbad database, with a search radius of 5 arcsec.
See also: I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) I/259 : The Tycho-2 Catalogue (Hog+ 2000) Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [GFM2007] Sequential number 3 A1 --- n_[GFM2007] [*] *: sources associated with the elongated PSF of source 48 (SVS 20) 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 14 F4.1 s RAs Right ascension (J2000) 16 A1 --- DE- Declination sign (J2000) 17- 18 I2 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 24 I2 arcsec DEs Declination (J2000) 26- 30 F5.2 ct/ks CR Count Rate 32- 35 F4.2 ct/ks e_CR rms uncertainty on CR 37- 40 F4.1 mag Jmag ?=- 2MASS counterpart J magnitude (1) 42- 45 F4.1 mag Hmag ?=- 2MASS counterpart H magnitude (1) 47- 50 F4.1 mag Kmag ?=- 2MASS counterpart K magnitude (1) 52- 54 F3.1 arcsec r ?=- radial distance from the 2MASS counterpart (1) 56 A1 --- Opt [UT0-] Associations with (T)ycho 2 (I/259) or (U)SNO-A2 (I/252) optical catalog sources (1) 58- 61 F4.1 mag Bmag ?=- B magnitude (1) 63- 66 F4.1 mag V/Rmag ?=- Tycho2 V magnitude or USNOA-2.0 R magnitude (1) 68- 70 I3 --- ISO ?=- ISO number, [KOB2004] NNN in Simbad (2) 71 A1 --- n_ISO [*] *: distance of ISO source greater than 3" 73- 76 A4 --- clISO ISO classification (2) (4) 78- 82 I5 --- IRsrc ?=- Spitzer IR source number (3) 83 A1 --- u_IRsrc [)] Uncertaitny flag on IRsrc (5) 84 A1 --- n_IRsrc [+] +: matching distance >1" (5) 86- 88 I3 --- YSO ?=- Spitzer YSO number (3) 90- 95 A6 --- clYSO YSO classification (3) (4)
Note (1): For the sources with a 2MASS counterpart (within a search radius of 3 arcsec) the values of their magnitude in the J, H and K bands are also given, together with the radial distance from this counterpart, the associations with Tycho 2 or USNOA-2.0 optical catalog sources and their optical magnitude. Note (2): The ISO field provides the source number and Class of the counterpart in the ISO catalogue by Kaas et al. (2004, Cat. J/A+A/421/623), also within a search radius of 3". Note (3): Source identification numbers and classification in the Spitzer data: the first id is the source IR id and the second one the YSO id number. Note (4): Classes of the Young Stellar Object as follows: I = Sources with a slope greater than 0 I/II = Flat Spectrum object (slope between 0.0 and -0.5) II = Sources that show excess emission from a circumstellar disk, with a slope between -0.5 and ~-3.5 II/III = Transition Disk object III = source exhibits photospheric emission, with slopes of ~-3.5 Note (5): All the counterparts are within 1" from the X-ray sources, unless their IR id is accompanied by + or is in between brackets. + = Although the matching distance is greater than 1", we are confident in the cross-identification reliability ) = some doubts remains (these are usually faint IR sources).
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [GFM2007] Sequential number 4- 5 I2 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 13 F4.1 s RAs Right ascension (J2000) 15 A1 --- DE- Declination sign (J2000) 16- 17 I2 deg DEd Declination (J2000) 19- 20 I2 arcmin DEm Declination (J2000) 22- 23 I2 arcsec DEs Declination (J2000) 26-107 A82 --- CrossId Cross-identifications (1)
Note (1): The acronyms are: [B96] = Bontemps (1996, Ph.D. Thesis) [CK86] = Churchwell & Koornneef (1986ApJ...300..729C, CK NN) [EC92] = Eiroa & Casali (1992A&A...262..468E) [GCN98] = Giovannetti et al. (1998, Cat. J/A+A/330/990, GCNM NNN) [HB96] = Hurt & Barsony (1996ApJ...460L..45H, [HB96] PS N ) [KOB2004] = Kaas et al. (2004, Cat. J/A+A/421/621) [KCM2004] = Klotz et al. (2004, Cat. J/A+A/425/927) [P2003] = Preibisch (2003A&A...410..951P) [SVS76] = Strom, Vrba & Strom (1976AJ.....81..638S, [SVS76] NGC 7129 & NN [SVS76] Ser NN).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Sep-2007
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