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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
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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