J/AJ/101/1408 Massive stars in Cyg OB2. (Massey+ 1991)
Massive stars in Cyg OB2. Massey P., Thompson A.B. <Astron. J. 101, 1408 (1991)> =1991AJ....101.1408M (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Photometry, UBV ; Photometry, CCD Description: The galactic association Cygnus OB2, which contains heavily reddened O and B stars, has been studied using CCD UBV photometry and spectroscopy. The file "mt91.dat" contains precise coordinates, UBV photometry, and spectral types from the study of Cygnus OB2, and merges the tables 2, 5 and 6 from the paper. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file mt91.dat 73 801 Observations in Cyg OB2 (tables 2,5,6)
See also: J/A+AS/111/407 : VI Cygni red + reddened stars (Parthasarathy+, 1995) J/AJ/107/1433 : Cygnus OB2 polarimetry (Kobulnicky+, 1994) J/MNRAS/298/753 : Variables in Cygnus OB2 (Pigulski+ 1998) Byte-by-byte Description of file: mt91.dat
Bytes Format Units Label Explanations
2- 4 I3 --- MT91 [1/799]+? Star identification (1) 8- 9 I2 h RAh Right Ascension J2000 (hours) (2) 11- 12 I2 min RAm Right Ascension J2000 (minutes) (2) 14- 18 F5.2 s RAs Right Ascension J2000 (seconds) (2) 21 A1 --- DE- Declination J2000 (sign) (2) 22- 23 I2 deg DEd Declination J2000 (degrees) (2) 25- 26 I2 arcmin DEm Declination J2000 (minutes) (2) 28- 31 F4.1 arcsec DEs Declination J2000 (seconds) (2) 35- 39 F5.2 mag Vmag ? V magnitude 42- 46 F5.2 mag U-B ? U-B colour derived from B-V 47 A1 --- u_U-B [:?] Uncertainty flag on U-B (3) 49- 53 F5.2 mag B-V ? B-V colour 54 A1 --- u_B-V [:?] Uncertainty flag on B-V (3) 57- 68 A12 --- SpType MK Spectral type (4) 70- 73 A4 --- Rem Remarks (5)
Note (1): the first two stars in the list were outside the MT91 survey area, but new spectral types for them were given in Table 6. The positions for these 2 stars come from the ACT and GSC v1.2, and agree with those in the table to within an arcsecond or so. Note (2): positions were computed from original x,y by Brian Skiff, see the "History" section below Note (3): the colon ':' indicates a uncertainty greater than 2-sigma, and the question mark '?' an error greater than 3-sigma (these were given as a double colon in the source paper) Note (4): only the MK spectral type determined by Massey & Thompson is listed here; types from other sources cited in the original tables were ignored. Note (5): The Remarks column shows those stars that were blended ('bl') in Massey & Thompson's analysis, and 'traditional' Schulte numbers (see 1956ApJ...124..530S) indicated in the MT91 tables (e.g. S 12).
Nomenclature Notes: The acronym "MT" is sometimes used to designate the stars from this list in the literature. MT91 should be preferred. History: An electronic copy of Table 2 was prepared by Jean-Claude Mermilliod (). The star positions were computed by Brian Skiff () from about 50 stars scattered across the four CCD fields, for which coordinates were found from the ACT or GSC version 1.2, plus a few faint stars from USNO-A1.0, with rms residuals of 0".6.
(End) Brian Skiff [Lowell Obs.], Francois Ochsenbein [CDS] 17-Sep-1998
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