III/231 The Tycho-2 Spectral Type Catalog (Wright+, 2003) ================================================================================ The Tycho-2 Spectral Type Catalog Wright C.O., Egan M.P., Kraemer K.E., Price S.D. =2003AJ....125..359W ================================================================================ ADC_Keywords: Cross identifications - MK spectral classification Keywords: stars: fundamental parameters - catalogs Description: We have obtained spectral types for 351,863 stars in the Tycho-2 catalog by cross-referencing the Tycho-2 catalog against the Michigan Catalogs , , , , and ; the Catalog of Stellar Spectra Classified in the Morgan-Keenan System ; the MK Classification Extension ; the FK5 catalog parts I and II and ; and the PPM North and South catalogs and . File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file catalog.dat 124 351863 Main Catalog appdxa.dat 19 104 Appendix of uncertain matches appdxb.dat 40 111408 Appendix of additional Tycho-2 stars -------------------------------------------------------------------------------- See also: I/259 : The Tycho-2 Catalogue (Hog+, 2000) IV/25 : HD Identifications for Tycho-2 Stars (Fabricius+, 2002) Byte-by-byte Description of file: catalog.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 A3 --- --- [TYC] Tycho-2 label 5- 8 I4 --- TYC1 First part of Tycho-2 identifier 10- 14 I5 --- TYC2 Second part of Tycho-2 identifier 16 I1 --- TYC3 Third part of Tycho-2 identifier 18- 29 F12.8 deg RAdeg Right Ascension, J2000, decimal deg. 31- 42 F12.8 deg DEdeg Declination, J2000, decimal deg. 44- 49 F6.3 mag VTmag ?=99.99 Tycho-2 V_T_ magnitude 51- 56 F6.3 mag BTmag ?=99.99 Tycho-2 B_T_ magnitude 58- 60 A3 --- r_SpType Source of spectral type (2) 62- 76 A15 --- Name Alternate designation for star (3) 78- 83 F6.3 arcsec Dist Distance between Tycho object and spectral type match (4) 85- 90 F6.2 mag Mag ?=99.99 Magnitude from SpType catalog (5) 92 A1 --- f_Mag [VPBX*] Flag indicating type of magnitude (6) 94 A1 --- TClass Temperature class (7) 95 I1 --- SClass ? Temperature Subclass (7) 97 I1 --- LClass ? Luminosity class in numeric form (7) 99-103 I5 K Teff Effective temperature of the star, based on spectral type (G1) 105-124 A20 --- SpType Spectral Type (1) -------------------------------------------------------------------------------- Note (1): This is the spectral type of the star, exactly as it appears in the original spectral type catalog. Note (2): This column contains a code for the catalog of origin of the spectral type: mc1 = Michigan Catalog, Vol. 1, mc2 = Michigan Catalog, Vol. 2, mc3 = Michigan Catalog, Vol. 3, mc4 = Michigan Catalog, Vol. 4, mc5 = Michigan Catalog, Vol. 5, j64 = Jaschek et al. 1964, k83 = Kennedy 1983, fI = FK5, Part I, fII = FK5, Part II, ppN = PPM North, ppS = PPM South, sim = SIMBAD Astronomical Database Note (3): This is an alternate designation for the star, other than its Tycho-2 identifier. It is usually the designation for the star that appeared in the spectral type catalog. Note (4): This is the distance in arcsec between the Tycho-2 object and the star from the spectral type catalog to which it was matched. Note (5): This is the magnitude that appears in the spectral type catalog. If no magnitude was included, it will have a value of 99.99. Note (6): This indicates the type of magnitude that appears in the spectral type catalog: V = visual P = photographic B = blue X = unknown * = no magnitude was included Note (7): In the spectral type reformatting, it was necessary to "choose" a concrete spectral type for those that were listed ambiguously, and the rule adhered to was to take the first listing. For example, if a spectral type was originally listed as K2/3 III, it will be K2 3, where K is the temperature class, 2 is the subclass, and 3 is the luminosity class. Other examples: A9/F2 V, B2.5 V, and G8 IV/V in the original catalog become A9 5, B2 5, and G8 4 in the reformatted spectral type -------------------------------------------------------------------------------- Byte-by-byte Description of file: appdxa.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 A3 --- --- [TYC] Tycho-2 label (1) 5- 8 I4.4 --- TYC1 First part of Tycho-2 identifier 10- 14 I5.5 --- TYC2 Second part of Tycho-2 identifier 16 I1 --- TYC3 Third part of Tycho-2 identifier 19 A1 --- Flag Flag indicating source of uncertainty (2) -------------------------------------------------------------------------------- Note (1): Objects are included in appdxa.dat if they were among the outliers in distance or magnitude, and further investigation yielded no more information about the pair. Note (2): Flags: d = the match is uncertain because the matched pair is separated by a distance greater than 5 arcsec. m = the match is uncertain because the matched pair has a magnitude difference greater than 2 mag. -------------------------------------------------------------------------------- Byte-by-byte Description of file: appdxb.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- TYC1 First part of Tycho-2 identifier (1) 6- 10 I5 --- TYC2 Second part of Tycho-2 identifier 12 I1 --- TYC3 Third part of Tycho-2 identifier 13 A1 --- f_TYC1 [S] Set for stars in Tycho-2 Supplement#1 15- 20 I6 --- HD Henry Draper identifier 22- 24 A3 --- SpType 1-D Spectral Type from HD catalog 26 I1 --- n_HD Number of HD stars for this Tycho-2 star 28 I1 --- n_TYC1 Number of Tycho-2 stars for this HD star 30 A1 --- TDSC [D] star in the Tycho-2 Double Star Catalog 32 A1 --- Rem [DEGMR*] Remarks flag from HD file (2) 34 A1 --- Note [N] note exists in notes.dat file (3) 36- 40 I5 K Temp ?=-9999 Temperature of star estimated from Spectral Type (G1) -------------------------------------------------------------------------------- Note (1): appdxb.dat includes additional Tycho-2 objects that do not appear in catalog.dat. These objects were taken from the Fabricius et al. (2002) catalog matching HD identifiers to Tycho-2 objects. With the exception of the last column (which we have added), the format and content of the appendix are identical to the format and content of catalog . Note (2): (This is taken directly from the ReadMe file of catalog ) D = Entry deleted (compared to the printed catalog) E = Image at edge of plate G = Position and BD number taken directly from AGK1 and precessed to 1900 M = Multiple images used R = Remark in the published catalog * = Spectral type refers to a cluster, nebula, or nebulous star Note (3): The notes.dat file is not included here, but is part of catalog . -------------------------------------------------------------------------------- Global Notes: Note (G1): We used tables (Lang, K.R. 1992, Astrophysical Data: Planets and Stars (Springer, New York)) to convert the spectral types to temperatures. If only a one-dimensional spectral type was given, we assumed a luminosity class (V if earlier than G5, III for G5-K9, and I for M-type stars) for the purposes of assigning a temperature. If no temperature subclass was provided, it was assumed to be 5 for the purposes of assigning a temperature. Finally, R stars were assumed to have the temperature properties of K stars; N, S, C and P stars were assumed to have the temperature properties of M stars; and W stars were assumed to have the temperature properties of O stars. Acknowledgements: Candace Wright ================================================================================ (End) Candace Wright [Boston College] 16-Oct-2002