Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/505/793       New WR star in M33                          (Massey+, 1998)

Evolved massive stars in the local group. II. A new survey for Wolf-Rayet stars in M33 and its implications for massive star evolution: evidence of the ``Conti scenario'' in action. Massey P., Johnson O. <Astrophys. J. 505, 793 (1998)> =1998ApJ...505..793M
ADC_Keywords: Stars, Wolf-Rayet ; Photometry Keywords: galaxies: stellar content - galaxies: Local Group - stars: evolution - stars: supergiants - stars: Wolf-Rayet Abstract: We expect the evolution of massive stars to be strongly influenced by mass loss and hence to be sensitive to metallicity. It should be possible to test this "Conti scenario" be comparing the populations of evolved massive stars among the Local Group galaxies, but such investigations have been hampered by incompleteness. In a previous paper, we presented results of a new survey for red supergiants (RSGs) in selected regions of the Local Group galaxies M33, M31, and NGC 6822. In the present paper, we survey eight fields in M33 for Wolf-Rayet stars (WRs), using interference-filter imaging with a CCD to select candidates. Follow-up spectroscopy is used to confirm 22 newly found WR stars, 21 of WN type. We establish that our survey would readily detect WRs as weak-lined as any known, and we conclude that our survey is essentially complete. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 156 146 WR candidates in M33 table9.dat 134 161 Wolf-Rayet stars in M33 table10.dat 97 54 Wolf-Rayet stars in M31 table11.dat 97 5 Wolf-Rayet stars in NGC 6822 AND IC 1613 table12.dat 97 17 Wolf-Rayet stars in IC 10
See also: J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995) Table 1: Survey fields -------------------------------------------------------------------------------- Field RA (2000) DE OB associations Comments -------------------------------------------------------------------------------- M33-A 01 35 01.3 +30 41 48 OB 88, 89 RSG survey M33-B 01 33 51.3 +30 45 14 OB 65-68 RSG survey M33-C 01 33 32.1 +30 40 50 OB 55-58, 61-63 NGC 595; contains AM 85 field 2 M33-D 01 32 55.6 +30 35 30 OB 20-22, 24 RSG survey M33-E 01 33 10.9 +30 29 50 OB 17, 115, 127, 128 RSG survey M33-F 01 33 40.3 +30 20 44 OB 110, 112 RSG survey M33-G 01 33 44.5 +30 33 22 OB 3, 6-14, 49-51 RSG survey; slight overlap with AM 85 field 1 M33-X 01 33 56.8 +30 38 25 OB 96, 142, 143 Includes nucleus -------------------------------------------------------------------------------- OB associations are from Humphreys & Sandage, 1980ApJS...44..319H. Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Field Field designation 7- 14 A8 --- Name Star designation in the field, new designation, [MJ98] in Simbad (1) 16 I1 --- No [1/2] Number of set of images that identified the star as WR candidate 17 A1 --- n_No [f] f: Star is within field of view of only one set of images 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 29 F5.2 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 41 F4.1 arcsec DEs Declination (J2000) 43- 46 F4.2 --- rho Distance from the nucleus within the plane of M33 (2) 48- 51 F4.1 mag WC-CT ? WC-CT colour index (3) 53- 57 F5.1 --- sWC-CT ? WC-CT significant level (3) 59- 62 F4.1 mag WN-CT ? WN-CT colour index (3) 64- 67 F4.1 --- sWN-CT ? WN-CT significant level (3) 69- 72 F4.1 mag WC-WN WC-WN colour index (3) 74- 78 F5.1 --- sWC-WN WC-WN significant level (3) 80- 83 F4.1 mag CTmag ? CT magnitude (3) 85- 87 A3 --- SpType Predicted spectral type 89-113 A25 --- SpTypea Actual spectral type (4) 115-156 A42 --- Com Comments (5)
Note (1): Names use the following nomenclature: AM: from Armandroff & Massey (1985ApJ...291..685A), AM NN = [AM85] M 33 NN in Simbad MC: from Massey & Conti (1983ApJ...273..576M), MC NN = [MC83] NN in Simbad MCA: from MCA87, Massey et al. (1987AJ.....94.1538M) (OB NN-NN = [MAP95] M 33 OBNN NN, W91-129 = [W91b] Star 129 in Simbad) all others are new from the present study. Note (2): We have assumed RAcenter=01:31:01.2, DEcenter=+30:24:27 (1950), an inclination of 57°, and position of the major axis of 20°, and normalized the distance to a Holmberg radius of 25', following Kwitter & Aller (1981MNRAS.195..939K). Note (3): Filters are centered at the following wavelength: WC filter: λ4650Å WN filter: λ4686Å CT filter: λ4752Å Note (4): Spectral types for previously known WR stars are from Massey & Conti, (1983ApJ...273..576M), MAC87, Massey et al. (1987AJ.....94.1538M), or Armandroff & Massey (1991AJ....102..927A). Note (5): The following abbreviations are used: Isolated: no stars within 1" as judged from HST WFPC2 images comp: companion brt: bright fnt: faint v.: very UIT: UV-bright source identified by Massey et al. (1996, in Wolf-Rayet Stars in the Framework of Stellar Evolution, ed. J.M. Vreux, A. Detal, D. Frainpont-Caro, D. Gosset & G. Rauw (Liege: Institut d'Astrophysique), 39 HS: blue star designation from Humphreys & Sandage (1980ApJS...44..319H) ob: blue star identified by Massey et al. (1995, Cat. J/AJ/110/2715)
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1 A1 --- Note [CR] C: Spectroscopically Confirmed M33 Stars R: Remaining candidates 3- 4 A2 --- --- [WR] 6- 9 A4 --- WR WR designation (new designation, [MJ98] in Simbad) 11- 20 A10 --- Name Previous name (1) 22- 23 I2 h RAh Right ascension (J2000) 25- 26 I2 min RAm Right ascension (J2000) 28- 32 F5.2 s RAs Right ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 44 F4.1 arcsec DEs Declination (J2000) 46- 49 F4.2 --- rho Distance from the nucleus within the plane of M33 (2) 51- 54 F4.1 mag CTmag ? CT (λ4752) magnitude 55- 56 A2 --- u_CTmag [: ] Uncertainty flag on CTmag 58- 63 A6 --- OB OB association designation (3) 64 A1 --- u_OB [)] Uncertainty flag on OB 66- 79 A14 --- SpType Spectral type 80- 85 A6 --- r_SpType References for spectral type (4) 87-134 A48 --- Com Comments
Note (1): Names use the following nomenclature: AM: Armandroff & Massey, 1985ApJ...291..685A ([AM85] M 33 NN) MC: Massey & Conti, 1983ApJ...273..576M ([MC83] NN) W&C: Wray & Corso, 1972ApJ...172..577W ([WC72] NN) MCA: Massey et al., 1987AJ.....94.1538M (MCA NN) OB: Massey et al., 1995, Cat. J/AJ/110/2715 ([MAP95] M 33 OBNN NN) UIT: Massey et al., 1996, in Wolf-Rayet Stars in the Framework of Stellar Evolution, ed. J.M. Vreux, A. Detal, D. Frainpont-Caro, D. Gosset & G. Rauw (Liege: Institut d'Astrophysique) 39 ([MBH96] NNN) W91: see Massey et al., 1995, Cat. J/AJ/110/2715 and present text ("W91 129" = [W91b] Star 129) CM: Conti & Massey, 1981ApJ...249..471C ([CM81] NN) HS B: Humphreys & Sandage (1980ApJS...44..319H) blue star NGC 595 and NGC 604 are WR candidates from the Drissen et al. (1993AJ....105.1400D) survey with HST. MJ ANN = [MJ98] ANN, this paper Note (2): We have assumed RAcenter=01:31:01.2, DEcenter=+30:24:27 (1950), an inclination of 57°, and position of the major axis of 20°, and normalized the distance to a Holmberg radius of 25', following Kwitter & Aller (1981MNRAS.195..939K). Note (3): OB association designations from Humphreys & Sandage (1980ApJS...44..319H). Note (4): Reference numbers are as follows: 1: MCA87, Massey et al., 1987AJ.....94.1538M 2: Willis et al., 1992A&A...261..419W 3: Smith et al., 1995A&A...302..830S 4: Massey et al., 1996, in Wolf-Rayet Stars in the Framework of Stellar Evolution, ed. J.M. Vreux, A. Detal, D. Frainpont-Caro, D. Gosset & G. Rauw (Liege: Institut d'Astrophysique), 39 5: AM91, Armandroff & Massey, 1991AJ....102..927A 6: Massey et al., 1995, Cat. J/AJ/110/2715 7: this paper 8: Schild et al. 1990A&A...237..169S 9: Conti & Massey, 1981ApJ...249..471C 10: Massey & Conti, 1983ApJ...273..576M
Byte-by-byte Description of file: table1?.dat
Bytes Format Units Label Explanations
1 A1 --- Note [CR] C: Spectroscopically Confirmed M33 Stars R: Remaining candidates 3- 13 A11 --- Name Name (1) 15- 16 I2 h RAh Right ascension (J2000) 18- 19 I2 min RAm Right ascension (J2000) 21- 25 F5.2 s RAs Right ascension (J2000) 27 A1 --- DE- Declination sign (J2000) 28- 29 I2 deg DEd Declination (J2000) 31- 32 I2 arcmin DEm Declination (J2000) 34- 37 F4.1 arcsec DEs Declination (J2000) 39- 42 F4.2 --- rho ? Distance from the nucleus 43 A1 --- l_CTmag Limit flag on CTmag 44- 47 F4.1 mag CTmag ? CT (λ4752) magnitude 48 A1 --- u_CTmag Uncertainty flag on CTmag 49- 52 A4 --- OB OB association designation (2) 53 A1 --- u_OB [)] Uncertainty flag on OB 55- 63 A9 --- SpType Spectral type 65- 69 A5 --- r_SpType References for spectral type (3) 71- 97 A27 --- Com Comments
Note (1): In table10.dat, identification are from ob: Massey et al., 1995, Cat. J/AJ/110/2715 MS: Moffat & Shara, 1983ApJ...273..544M IT: Moffat & Shara, 1987ApJ...320..266M In table11.dat, identifications are from AM85, Armandroff & Massey, 1985ApJ...291..685A. In table12.dat: identifications are from Massey et al., 1992AJ....103.1159M Note (2): the nomenclature is: table10.dat: OB association designations from van den Bergh, 1964ApJS....9...65V. We have assumed that OB 75 is the small, unlabeled association direction north of OB 80 table11.dat: OB association numbers for NGC 6822 are from Hodge, 1977ApJS...33...69H. The IC 1613 WR star falls within H II Region No. 3 catalogued by Sandage, 1971ApJ...166...13S Note (3): References are numbered as follows: 1: Moffat & Shara, 1983ApJ...273..544M 2: AM91, Armandroff & Massey, 199AJ....102..927A 3: Schild et al. 1990A&A...237..169S 4: Willis et al., 1992A&A...261..419W 5: Massey et al., 1995, Cat. J/AJ/110/2715 6: MCA87, Massey et al., 1987AJ.....94.1538M 7: Massey et al., 1986AJ.....92.1303M 8: Massey 1998, in Stellar Astrophysics for the Local Group: A First step to the Universe, Proc. 8th Canary Island Winter School, ed. A. Herraro & A. Aparico (Cambridge: Cambridge Univ. Press.), in press. 9: Moffat & Shara, 1987ApJ...320..266M 10: Westerlund et al., 1983A&A...123..159W 11: Massey & Armandroff, 1995AJ....109.2470M
History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 08-Dec-1998
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

catalogue service

© UDS/CNRS

Contact