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J/A+A/458/225  Photometric standard stars in the field of GR 290 (Viotti+, 2006)

The present status of four luminous variables in M 33. Viotti R.F., Rossi C., Polcaro V.F., Montagni F., Gualandi R., Norci L. <Astron. Astrophys. 458, 225 (2006)> =2006A&A...458..225V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, standard ; Photometry, UBVRI Keywords: stars: evolution - stars: variables: general - supergiants - galaxies: individual: M 33 Abstract: Understanding the origin of the instabilities of LBVs is important for shedding light on the late evolutionary stages of massive stars and on the chemical evolution of galaxies. To investigate the physical nature of variable stars in the upper H-R diagram, we performed a spectrophotometric study of the Romano's star GR 290 and the Hubble-Sandage variables A, B, and C in the close galaxy M 33. New spectroscopic and photometric data were employed in conjunction with already published data of these stars in order to derive spectral types, energy distribution and bolometric luminosities. Description: File "table2.dat" contains the name, J2000 coordinates, UBVRI photometry of stars used as photometric standard stars for the field around the Romano's star (GR 290) in M 33. File "GR290_field.JPG" is the identification chart of standard stars in the field of GR 290. North is up, East to the left. About 8x8arcmin2 field. GR 290 is marked GR. Just to its right there is the association OB 89 (with the stars 89-6, 2115, 2121, and 2124). Further to the right there is the association OB 88 (with the stars 88-1. 3, 4, 9, and 10). Star 2112 is just beyond the lower border of the image. In the map the stars are marked by the last digit(s) of their names in Table 2. The magnitudes of stars A, B, p, q, -2, and -3 are not reported. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 01 35 09.7 +30 41 57 GR 290 = SV* GR 290 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 84 19 Stars used as photometric standard stars GR290_field.jpg 512 1559 jpeg identification chart of standard stars in the field of GR 290
See also: J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995) J/ApJ/501/153 : VRB photometry of red supergiants (Massey 1998) J/ApJS/89/85 : Blue and red supergiants in M33 (Ivanov+ 1993) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 ----- Name Star's name (1) 10- 11 I2 h RAh Right ascension (J2000) 13- 14 I2 min RAm Right ascension (J2000) 16- 20 F5.2 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign (J2000) 23- 24 I2 deg DEd Declination (J2000) 26- 27 I2 arcmin DEm Declination (J2000) 29- 32 F4.1 arcsec DEs Declination (J2000) 34- 38 F5.2 mag Umag ? U magnitude (no error reported) (2) 40- 44 F5.2 mag Bmag B magnitude (2) 46- 49 F4.2 mag e_Bmag ? Error on B magnitude 51- 55 F5.2 mag Vmag V magnitude (2) 57- 60 F4.2 mag e_Vmag ? Error on V magnitude 62- 66 F5.2 mag Rmag ? R magnitude (2) 68- 71 F4.2 mag e_Rmag ? Error on R magnitude 73- 77 F5.2 mag Imag ? I magnitude (2) 79- 82 F4.2 mag e_Imag ? Error on I magnitude 84 I1 --- Notes [1-4]? Notes (3)
Note (1): Star's nomenclature: * ku-a..h = a..h standard stars from R. Kurtev et al. (2001RMxAA..37...57K). Their B-magnitudes have been revised. * M33a-78, 262 and 314 = stars from P. Massey (1998, Cat. J/ApJ/501/153, [M98a] M 33a-NNN in Simbad). * 2115..2126 = IFM-B stars from Table 2 of G.R. Ivanov et al. (1993,Cat. J/ApJS/89/85), IFM-B NNNN in Simbad. * 88-n, 89-n = stars in clusters OB88-OB89 (see Table 1 (J/A/110/2715/m33) of P. Massey et al. (1995, Cat. J/AJ/110/2715) [MAP95] M 33 OB88 NN and [MAP95] M 33 OB89 N in Simbad. * Cross identification: IFM-B 2124 is also [MJ98] WR 142. The stars IFM-B 2115, 2121, and 2124 belong to the association OB89. Note (2): Sources for the photometry: * U B V for the stars of clusters OB 88 and OB 89 are from P. Massey et al. (1995, Cat. J/AJ/110/2715). No errors are reported by the authors. * For the other stars B V R I are from Franco Montagni's Greve 30cm telescope using the standard stars in the fields of the blazars B0109+224 and B0235+1624. The BVRI data were refined using the CCD images taken at the Cima Ekar. Note (3): Notes as follows: 1 = ku-a to ku-h are the standard stars used for the B measurements by Kurtev et al. (2001RMxAA..37...57K). The V R I and the revised B magnitudes have been measured by Franco Montagni. 2 = M33a-78, M33a-262, and M33a-314 are from P. Massey (1998ApJ...501..153M). 3 = 89-6 is star no.6 in the association OB89; it is also star 460 in Table 1 (J/A/110/2715/m33) of P. Massey et al. (1995, Cat. J/AJ/110/2715). 4 = The OB88 stars 88-1, 2, 3, 4, 9, and 10 are stars 475, 477, 478, 483, and 484, respectively, in Table 1 (J/A/110/2715/m33) of Massey et al. (1995, Cat. J/AJ/110/2715).
Acknowledgements: Roberto F. Viotti, roberto.viotti(at)iasf-roma.inaf.it The authors will appreciate any improvement of the data and additions to the table.
(End) Patricia Vannier [CDS] 09-Oct-2006
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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