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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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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
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Byte-by-byte Description of file: appdxa.dat
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: appdxb.dat
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Bytes Format Units Label Explanations
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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)
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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.
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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