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J/PASJ/60/739       Emission-line stars in the W5E HII region   (Nakano+, 2008)

Clustering of emission-line stars in the W5E H II region. Nakano M., Sugitani K., Niwa T., Itoh Y., Watanabe M. <Publ. Astron. Soc. Jap., 60, 739-748 (2008)> =2008PASJ...60..739N
ADC_Keywords: H II regions ; Photometry, SDSS ; Equivalent widths Keywords: ISM: H II regions - ISM: individual (W5) - stars: formation - stars: pre-main-sequence Abstract: We have made a new survey of emission-line stars in the W5 E HII region to investigate the population of PMS stars near the OB stars by using the Wide Field Grism Spectrograph 2 (WFGS2). A total of 139 Halpha emission stars were detected and their g'i'-photometry was performed. Their spatial distribution shows three aggregates, i.e., two aggregates near the bright-rimmed clouds at the edge of the W5 E HII region (BRC 13 and BRC 14) and one near the exciting O7V star. The age and mass of each Halpha star were estimated from an extinction-corrected color-magnitude diagram and theoretical evolutionary tracks. We found, for the first time in this region, that the young stars near the exciting star are systematically older (4Myr) than those near the edge of the HII region (1Myr). This result supports that the formation of stars proceeds sequentially from the center of HII region to the eastern bright rim. We further suggest a possibility that the birth of low-mass stars near the exciting star of the HII region precedes the production of massive OB stars in the pre-existing molecular cloud. Description: The Halpha survey and the optical photometry of the region were conducted in 2006 September 22 and 24. We used the Wide Field Grism Spectrograph 2 (WFGS2) mounted on the University of Hawaii 2.2-m telescope. The number of Hα-emission stars are: ---------------------------------------------------------------- RA (2000) DE Designation(s) (Nb of Hα stars) ---------------------------------------------------------------- 03 01 09.9 +60 39 28.0 W5 E-a 16 03 01 38.2 +60 29 00.3 W5 E-b 45 03 00 16.9 +60 31 57.5 W5 E-c 52 02 59 23.0 +60 35 24.0 W5 E-d 40 ---------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 95 139 Summary of Hα stars
See also: J/AJ/123/2597 : Halpha stars and HH objects near BRCs (Ogura+, 2002) J/PASJ/58/L29 : JHK photometry of low-mass stars in BRC 14 (Matsuyanagi+, 2006) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [NSN2008] Sequential number 5- 10 A6 --- Name Name (1) 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 22 F5.2 s RAs Right ascension (J2000) 24 A1 --- DE- Declination sign (J2000) 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 34 F4.1 arcsec DEs Declination (J2000) 36- 38 F3.1 mag g'-i' ?=- g'-i' colour index 40- 43 F4.1 mag i'mag ?=- i' magnitude 45 A1 --- l_EW Limit flag on EW 46- 50 F5.1 0.1nm EW ?=- Hα equivalent width 52- 54 F3.1 mag AV ?=- Absorption in V band 56- 71 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs) 72 A1 --- q_2MASS [*] Good 2MASS quality flag (2) 74- 75 A2 --- Flag [wc] wc for weak continuum 77- 95 A19 --- Rem Other names (3)
Note (1): Names as: a-NNNN for W5 E-a region, [NSN2008] a-NNNN in Simbad b-NNNN for W5 E-b region, [NSN2008] b-NNNN in Simbad c-NNNN for W5 E-c region, [NSN2008] c-NNNN in Simbad d-NNNN for W5 E-d region, [NSN2008] d-NNNN in Simbad Note (2): the asterisk (*) indicates a good photometric quality in all three bands (J,H,Ks) Note (3): Other names as: [OSP]NN-NN = Hα star from Ogura et al. (2002, Cat. J/AJ/123/2597), [OSP2002] BRC NN NN in Simbad [MIS]NN = YSO candidate from Matsuyanagi et al. (2006, Cat. J/PASJ/58/L29), [MIS2006] NN in Simbad
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Mar-2009
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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