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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. <Astron. J., 125, 359 (2003)> =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 I/259 by cross-referencing the Tycho-2 catalog against the Michigan Catalogs III/31, III/51, III/80, III/133, and III/214; the Catalog of Stellar Spectra Classified in the Morgan-Keenan System III/18; the MK Classification Extension III/78; the FK5 catalog parts I and II I/149 and I/175; and the PPM North and South catalogs I/146 and I/193. 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 VT magnitude 51- 56 F6.3 mag BTmag ?=99.99 Tycho-2 BT 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, III/31 mc2 = Michigan Catalog, Vol. 2, III/51 mc3 = Michigan Catalog, Vol. 3, III/80 mc4 = Michigan Catalog, Vol. 4, III/133 mc5 = Michigan Catalog, Vol. 5, III/214 j64 = Jaschek et al. 1964, III/18 k83 = Kennedy 1983, III/78 fI = FK5, Part I, I/149 fII = FK5, Part II, I/175 ppN = PPM North, I/146 ppS = PPM South, I/193 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 --- 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 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 IV/25 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 IV/25. Note (2): (This is taken directly from the ReadMe file of catalog IV/25) 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 IV/25.
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
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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