II/43 K-Line Photometry of Southern A Stars, Table I (Henry+ 1971)
K-Line Photometry of Southern A Stars, Table I: Summary of Data on Southern A Stars Henry R.C. and Hesser J.E. <Astrophys. J. Suppl., 23, 421 (1971)> =1971ApJS...23..421H
ADC_Keywords: Photometry, K-line ; Stars, A-type Description: The photoelectric measurements of the strength of the Calcium K-line has been extended by 223 stars of predominantly southern or equatorial declinations which are well distributed in right ascension. This has expanded the existent list to 369 field stars for which a k-index is available, including many more Am stars. All available k-index data for field stars are presented here. Introduction: The present work represents a continuation of that described previously (Henry 1968ApJ...152L..87H, 1969ApJS...18...47H [hereinafter referenced as Paper I]), in which the K-line of calcium at 3933Å is measured photoelectrically in A-type stars with a narrow-band spectrometer. The result for each star is a K-line-strength index, called k, the value of which appears to depend predominantly only on the temperature of the star and the abundance of calcium in its atmosphere. The temperature dependence is well known; the abundance dependence appears as a correlation between the residual dK in K (after allowance for the temperature effect) and the difference from normal of the general metallicity index [m1] of Stromgren (1966). Alternatively, it was shown in Paper I that the calcium abundance is probably the effective factor in producing the scatter in the relation between k and b-y by a process of elimination of other parameters (luminosity, etc.) that were found not to affect appreciably the value of k. The value of k is, however, affected by a third parameter, namely, whether the star is an Am star or not. Many of the stars of Paper I were reobserved in order to tie in the new measurements with the old ones. An emphasis was laid on observing more Am stars, and on observing some stars that are of somewhat earlier spectral types than the earliest ones observed previously. Simultaneously with the field-star measurements described here, extensive data were acquired for the A stars in five open clusters (Hyades, Pleiades, IC 2391, IC 2602, and NGC 6475) and one association (Orion), as described in Paper III (Hesser and Henry 1971ApJS...23..453H). The observations were made with the same instrument that was used to obtain the data for Paper I, and a description of the instrument may be found in that paper. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file data.dat 111 369 Data from table 1
Byte-by-byte Description of file: data.dat
Bytes Format Units Label Explanations
1- 4 I4 --- HR HR Number (Cat. V/50) 5- 9 F5.2 mag Vmag *Visual Magnitude from BSC. 11- 15 F5.2 mag B-V ? (B-V)-Color from BSC. 17- 21 F5.3 mag Knew ? New k-Index in Magnitude 23- 27 F5.3 mag e_Knew *? RMS-Error of New k-Index 28- 33 F6.3 mag K *Final Value of k-Index 35- 39 F5.3 mag e_K ? RMS-Error of final k-Index 40- 45 F6.3 mag dK *? Deviation of k-Index 47 A1 --- class *[LIE] Class of the Star 49- 54 F6.3 mag b-y *? (b-y)-Color from Stromgren-Perry Catalogue 55- 60 F6.3 mag E(b-y) *? Color excess 62- 66 F5.3 mag beta *? beta-Index 68- 72 F5.3 mag m1 ? Stromgren m1-Reddening-Independent-Index 73- 78 F6.3 mag dm1 *? Deviation of m1-Index 80- 84 F5.3 mag c1 ? Stromgren c1-Reddening-Independent-Index 86- 89 F4.2 mag dV *? Magnitudes Above the Main-Sequence 91- 95 F5.3 mag u-b ? (u-b)-Index of Stromgren 96-101 F6.3 mag a *? a-Index or dm1 102-107 F6.3 mag r ? r-Luminosity-Index of Stromgren; I-Stars 109-111 I3 --- ID record number
Note on Vmag: Hoffleit (1964, see Cat. V/50), but, where necessary, from Blanco et al. (1968) Note on e_Knew: RMS error was not calculated if fewer than 4 observations were available. Note on K: If fewer than 4 new observations were available, then present data were combined with data from paper I. Note on dK: Deviation of k-index from the normal value for stars of the same color. A positive dK has the sense of an over-abundance of calcium. Note on class: on the system of Stromgren (1966) L = Late group star (later than A3) I = Intermediate star (A0-A3) E = Early star (B stars) Note on b-y: Stromgren & Perry (1965) and Crawford et al. (1970AJ.....75..624C) Note on E(b-y): Determined by the method of Stromgren. This value has been added to observed (b-y) to obtain the b-y values given in this catalog. Note on beta: Crawford & Mander (1966AJ.....71..114C) and Crawford et al. (1966AJ.....71..709C, 1970AJ.....75..624C) Note on dm1: Deviation of m1-index from the value for normal main-sequence stars. A negative value indicates high metal abundances. Note on dV: The number of magnitudes the star has evolved above the main-sequence calculated from data of c1-index. Note on a: For E-group stars this is d(m1) calculated by the alternate method while for I-group stars it is the a-index temperature parameter of Stromgren.
References: Blanco V.M., Demers S., Douglass G.G., and FitzGerald M.P. 1968, Pub. U.S. Naval Obs., Vol. 21. Crawford D.L. 1970, in Stellar Rotation, ed. A. Slettebak (Dordrecht: D. Reidel Publishing Co.), p. 204. Crawford D.L., Barnes J.V., Faure B.Q., Golson J.C., and Perry C.L. 1966, A.J., 71, 709. (1966AJ.....71..709C) Crawford D.L., Barnes J.V. and Golson J.C. 1970, A.J., 75, 624. (1970AJ.....75..624C) Crawford D.L. and Mander J. 1966, A.J., 71, 114. (1966AJ.....71..114C) Henry R.C. 1968, Ap. J. (Letters), 152, L87. (1968ApJ...152L..87H) Henry R.C. 1969, Ap. J. Suppl., 18, 47 (1969ApJS...18...47H) (Paper I). Hesser J.E. and Henry R.C. 1971 Ap. J. Suppl., 23, 453 (Paper III). (1971ApJS...23..453H) Hoffleit D. 1964, Catalog of Bright Stars (New Haven: Yale University Obs.). (See Cat. V/50) Stromgren B. 1963, Quart. J. Roy. Astron. Soc., 4, 8. Stromgren B. 1966, Ann. Rev. A&A, 4, 433. Stromgren B. 1967, in The Magnetic and Related Stars, ed. R. C. Cameron (Baltimore: Mono Book Corp.), p. 461. Stromgren B., and Perry C.L. 1965, unpublished.
(End) Julie Anne Watko [SSDOO/ADC] 10-Apr-1996
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