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J/AJ/105/226                  UMa Group                        (Soderblom+ 1993)

Stellar kinematic groups. I. The Ursa Major Group SODERBLOM D.R., MAYOR M. <Astron. J. 105, 226 (1993)> =1993AJ....105..226S
ADC_Keywords: Populations, stellar; Combined data; Astrometric data; Space velocities; Spectral types; Colors; Spectroscopy;Equivalent widths Abstract: The Ursa Major Group (UMaG) is studied as a test case for the authenticity of Stellar Kinematic Groups, using Coravel radial velocities, recent compilations of astrometric data and new spectroscopic observations. Spectroscopic age indicators, particularly indices of the strength of chromospheric emission, are applied to solar-type candidate members of UMaG, and it is shown that stars that meet the spectroscopic criteria also have kinematics that agree better with the space motions of the nucleus of UMaG than does the starting sample as a whole. The primary limitation on the precision of kinematics is now parallaxes instead of radial velocities. These more restrictive kinematic criteria are then applied to other UMaG candidates and a list summarizing membership is presented. UMaG is also examined as a cluster, confirming its traditional age of 0.3 Gyr and a mean [Fe/H] of -0.08 ± 0.09 for those stars most likely to be bona fide members. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 76 14 Stellar kinematic groups table3 68 35 Echelle spectroscopy of UMaG candidates table5 99 46 Spectroscopic membership indicators for UMaG solar-type stars table7 112 40 Kinematics of UMaG solar-type candidates table10 112 27 Kinematics of additional UMaG candidates table11 76 43 Summary of UMaG membership
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 32 A32 --- Name Group name 34- 37 I4 km/s U U space velocity 39- 42 I4 km/s V V space velocity 45- 47 I3 km/s W W space velocity 50- 76 A27 --- Ref References
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 6 I6 --- HD Henry Draper number 7- 8 A2 --- m_HD Multiplicity index on HD number 11 A1 --- l_vsini limit flag on vsini 12- 15 F4.1 km/s vsini []? Rotational velocity 17 A1 --- l_WHalpha Limit flag on Walpha 18- 21 F4.2 0.1pm WHalpha []? Equivalent width of Halpha line 23 A1 --- l_W8498 Limit flag on W8498 24- 27 F4.2 0.1pm W8498 []? Equivalent width of 8498A feature 29 A1 --- l_W8542 Limit flag on W8542 30- 33 F4.2 0.1pm W8542 []? Equivalent width of 8542A feature 35 A1 --- l_W8662 Limit flag on W8662 36- 39 F4.2 0.1pm W8662 Equivalent width of 8662A feature 42 A1 --- l_RHalpha Limit flag on RHalpha 43- 47 F5.2 --- log(RHalpha) []? Chromospheric flux ratio (stellar surface flux divided by bolometric flux) for Halpha 48 A1 --- u_RHalpha Uncertainty flag (only for star HD 141003B) 49 A1 --- l_R8498 Limit flag on R8498 50- 54 F5.2 --- log(R8498) []? Chromospheric flux ratio for 8498A feature 56 A1 --- l_R8542 Limit flag on R8542 57- 61 F5.2 --- log(R8542) []? Chromospheric flux ratio for 8542A feature 63 A1 --- l_R8662 Limit flag on R8662 64- 68 F5.2 --- log(R8662) Chromospheric flux ratio for 8662A feature
Byte-by-byte Description of file: table5
Bytes Format Units Label Explanations
1 A1 --- Member [abc] a: Probable spectroscopic member b: Possible spectroscopic member c: Probable spectroscopic non-member 3- 8 A6 --- Wooley Number in catalog of Woolley, et al. (1970) 10- 15 I6 --- HD/HDE Henry Draper number 16- 17 A2 --- m_HD/HDE Multiplicity index on HD or HDE number 19- 22 I4 --- HR []? Harvard Revised (Bright Star) number 23- 24 A2 --- m_HR Multiplicity index on HR number 26- 36 A11 --- Name Other name 38- 41 A4 --- Sp Spectral type (1) 44- 47 F4.2 mag B-V []? (B-V) color from Nicolet (1978) or Woolley et al. (1970) 48 A1 --- u_B-V uncertainty flag on B-V 50- 53 I4 K Teff []? Effective temperature 54 A1 --- u_Teff uncertainty flag on Teff 56 A1 --- l_R' [<H] limit flag on R'(HK). An 'H' indicating that Log(R') is instead an eye estimate of H and K emission strength from Wilson & Woolley (1970) 57- 61 F5.2 --- logR' []? Chromospheric flux ratio of the Ca II H and K emission features 62 A1 --- u_logR' uncertainty flag on R' 63 A1 --- n_R(hk) [I] An 'I', indicating logR(hk) is an I(Mg II) value 64- 68 F5.2 --- logR(hk) []? Rescaled index, the Mg II h and k emission flux divided by the stellar bolometric flux and reduced to the scale of the Ca II H and K emission in logR' 70 A1 --- l_R(TR) limit flag on R(TR) 71- 75 F5.2 --- logR(TR) []? Rescaled index, the emission flux of three strong features in IUE spectra (N I 1240 A, Si IV 1400 A, and C IV 1550 A) combined to produce an index of emission from the star's transition region (TR), reduced to the scale of the Ca II H and K lines as above. 77 A1 --- l_R(Halpha) uncertainty flag on R(Halpha) 78- 82 F5.2 --- logR(Halpha) []? Rescaled index, logR(Halpha). 83 A1 --- u_R(Halpha) rms uncertainty on R(Halpha) 84 A1 --- l_R(IRT) uncertainty flag on R(IRT) 85- 89 F5.2 --- logR(IRT) []? Rescaled index, for the Ca II infrared triplet. 91 A1 --- l_vsini limit flag on vsini 92- 95 F4.1 km/s vsini []? Rotational velocity 97- 99 F3.1 km/s e_vsini []? rms uncertainty in v sin i
Note (1): Spectral type from the Bright Star Catalog (Hoffleit & Jaschek 1982), Levato & Abt (1978), Hoffleit et al. (1983), and Woolley, et al. (1970) except for HD 26913/23 (see notes in printed paper).
Byte-by-byte Description of file: table7 table10
Bytes Format Units Label Explanations
1- 6 I6 --- HD Henry Draper number 7- 8 A2 --- m_HD Multiplicity index on HD number 9- 13 F5.1 mas plx Parallax from the latest Yale Parallax Catalog (van Altena et al. 1992) 15- 18 F4.1 mas e_plx []? rms uncertainty on plx 20- 23 I4 mas/yr pmRA Proper motion in right ascension from the Catalog of Positons and Proper Motions (PPM, Roeser & Bastian 1989) 25- 28 F4.1 mas/yr e_pmRA rms uncertainty on pmRA 30- 34 I5 mas/yr pmDE Proper motion in declination from the PPM 36- 38 F3.1 mas/yr e_PMDE rms uncertainty on pmDE 41- 45 F5.1 km/s RV []? Radial velocity from Evans (1980) 47- 49 F3.1 km/s e_RV []? rms uncertainty on RV 52- 56 F5.1 km/s U []? Resultant U component of space motion 58- 61 F4.1 km/s e_U []? rms uncertainty on U 63- 67 F5.1 km/s V []? Resultant V component of space motion 69- 71 F3.1 km/s e_V []? rms uncertainty on V 73- 77 F5.1 km/s W []? Resultant W component of space motion 79- 81 F3.1 km/s e_W []? rms uncertainty on W 84- 88 F5.1 mas plx2 []? Parallax the star must have if V is forced to a value of +2.0 km/s, given its observed radial velocity RV (table7 only) 90- 94 F5.2 mag MV2 []? Absolute visual magnitude that follows from the parallax plx2 (table7 only) 96-100 F5.1 km/s RV2 []? Radial velocity that results if the parallax is held fixed and the space motion V is forced to +2.0 km/s (table7 only) 102-106 F5.1 km/s U2 []? U space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only) 108-112 F5.1 km/s W2 []? W space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only)
Byte-by-byte Description of file: table11
Bytes Format Units Label Explanations
1 A1 --- Member + = Probable Members, ? = Possible Members (1) 4- 9 I6 --- HD Henry Draper number 10- 11 A2 --- m_HD Multiplicity index on HD number 13- 16 I4 --- HR []? Harvard Revised number 17 A1 --- m_HR Multiplicity index on HR number 20- 32 A13 --- Name Other name 35- 42 A8 --- Sp Spectral type 44- 48 F5.2 mag B-V (B-V) color 51- 54 I4 K Teff Effective temperature 56- 60 F5.2 mag Mv Absolute visual magnitude 63- 76 A14 --- Rem Remarks
Note (1): +: Probable Members: These are stars for which every indicator supports UMaG membership, which includes: (1) The stars of the nucleus. (2) The probable spectroscopic member stars of Table 5, with Xi Boo excluded. (3) Other stars, such as Sirius, that have well-defined space motions that agree (to within one standard deviation) with the mean motion of the nucleus. ?: Possible Members: In these cases the 3-sigma error ellipsoid overlaps the mean motion of the nucleus. The possible spectroscopic member stars of Table5 that have kinematics in accord with the nucleus are included here. Probable Nonmembers: Any star not listed in Table 11 has been rejected as a UMaG member.
References: Boesgaard et al. 1988, ApJ, 325, 749 Boss, 1937, General Catalogue of 33342 Stars (Carnegie Institute, Washington), No. 48 Eggen 1958a, MNRAS, 118, 65 Eggen 1958b, MNRAS, 118, 154 Eggen 1958c, MNRAS, 118, 560 Eggen 1959a, Obs, 79, 88 Eggen 1959b, Obs, 79, 182 Eggen 1960b, MNRAS, 120, 563 Eggen 1964, R. Obs. Bull., No. 84 Eggen 1965c, Obs, 85, 191 Eggen 1969, PASP, 81, 553 Eggen 1971a, PASP, 83, 251 Eggen 1971b, PASP, 83, 271 Eggen 1975, PASP, 87, 37 Eggen 1978, ApJ, 222, 203 Eggen 1983a, AJ, 88, 642 Eggen 1985, PASP, 97, 807 Eggen 1986a, PASP, 98, 423 Eggen 1987, in The Galaxy, edited by G. Gilmore and B. Carswell (Reidel, Dordrecht), p. 211 Eggen 1989, Fund. Cosmic Phys., 13, 1 Eggen and Sandage 1959, MNRAS, 119, 255 Evans 1980, Catalog of Stellar Radial Velocities Microform (Centre de Donnees Stellaires, Strasbourg) Hoffleit & Jaschek 1982, Bright Star Catalog, 4th edition (Yale University, New Haven) Hoffleit et al. 1983, A Supplement to the Bright Star Catalog (Yale University, New Haven) Levato & Abt 1978, 1978, PASP, 90, 429 Nicolet 1978, A&AS, 34, 1 Roeser & Bastian 1989, Catalog of Positons and Proper Motions, Bull. Inf. Centre de Donnees Stellaires, No. 37, p. 153 Roman 1949, ApJ 110, 205 van Altena et al. 1992, Yale Parallax Catalog, in preparation. Wilson & Woolley 1970, MNRAS, 148, 463 Woolley et al. 1970, R. Obs. Ann., No. 5 Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 06-Jul-1994
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