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J/PASP/108/313                      Empirical stellar flux scales (Hall 1996)

On the determination of empirical stellar flux scales Hall J.C. <Publ. Astron. Soc. Pac. 108, 313 (1996)> =1996PASP..108..313H
ADC_Keywords: Spectrophotometry Abstract: Several studies have appeared in the literature describing methods for deriving stellar continuum fluxes as simple functions of Johnson color indices. In previous papers, we have used similar relations to derive Ca II H & K line core fluxes for dwarf stars on Lowell Observatory's Solar-Stellar Spectrograph (SSS) program. Our desire is to present our data, and complementary data from the Mt. Wilson and National Solar Observatory stellar and solar programs, in terms of physical fluxes. However, our existing relations break down for mid-K and later stars and for giant stars, which form an important element of our target list. In this work I have used a broader range of spectrophotometry and angular diameters than in our previous work to derive empirical flux scales for spectral types A to early M, luminosity classes I to V, and for four color indices, Johnson B-V, V-R, R-I, and Stromgren b-y. In this paper I describe the methods I used and present the derived flux scales. I compare the results with those from earlier studies and present examples of the use of the flux scales. The data and results are available on the World Wide Web home page. Access http://www.lowell.edu, select "Lowell staff", and select the author's home page. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 63 26 Empirical flux scales table5.dat 67 146 Table of references table6.dat 64 146 Stellar properties blanket.dat 89 155 Line blanketing coefficients
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Bandpass *Bandpass 15- 17 A3 --- CI Color index 19- 24 F6.3 --- C0 *Zeroth-order coefficient of flux scale 26- 32 F7.3 --- C1 *First-order coefficient of flux scale 34- 38 F5.3 --- sigmad Error in dex of flux scale relation 40- 41 I2 % sigmap Error in percent of flux scale relation 43- 48 F6.2 mag CRb *Blue end of CI range 50- 54 F5.2 mag CRr *Red end of CI range 58- 63 A6 --- LC Luminosity classes
Note on Bandpass: The continuum flux of a star of color index X in one of the three bandpasses given in the table is: F(cont)=(C0+(C1*X))±[sigmad(dex), or ∼sigmap(%)], with units of mW/m2/(0.1nm). Any pair of coefficients [C0, C1] applies only to the indicated luminosity classes, and only to the indicated color range. Due to rapidly decreasing numbers of data points at the extrema of the color range (resulting from the difficulty of doing spectrophotometry at those extrema, particularly for K and M stars), the fits degrade rapidly beyond the indicated ranges. Note on C0, C1: These are the coefficients to be entered in a relation of the form log(F(lambda))=C0+C1(CI), C0 is the zeroth-order coefficient, C1 is the first-order coefficient, and CI is the color index corresponding to those coefficients. Note on CRb, CRr: These fields indicate the range of the particular color index for which a pair of flux-scale coefficients may be used. A flux-scale relation should never be applied outside these limits, because of the many quantities that go into deriving the stellar continuum fluxes, as well as the rapidly changing and uncertain nature of these quantities at the color index extrema (e.g.blanketing).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD Henry Draper Catalogue number 8- 19 A12 --- Name Star name 20- 44 A25 --- rSp *Spectrophotometric references 45- 50 A6 --- rD *Reference for star's angular diameter 52- 63 A12 --- rBl *Reference for blanketing coefficients 64- 67 A4 --- rb-y *Reference for Stromgren b-y index
Note on rSp, rD, rBl, rb-y: rSp is the spectrophotometric references for the star. The main reference used in making the flux scales is listed first. Other references are listed in parentheses, "()". Standard stars of Taylor (1984ApJS...54..167T) and Hayes & Latham (1975, ApJ 197, 593) are listed in angle brackets, "<>". Abbreviations for all references are as follows: B76 = Breger (1976ApJS...32....7B) BEM78 = Barnes, Evans, & Moffett (1978MNRAS.183..285B) BL94 = Blackwell & Lynas-Gray (1994A&A...282..899B) BHNT66 = Baschek et al. (1966ZA.....65..418B) BO65 = Baschek & Oke (1965ApJ...141.1404B) CB70 = Crawford & Barnes (1970AJ.....75..946C) DP71 = Dickens & Penny (1971MNRAS.153..287D) HL75 = Hayes & Latham (1975ApJ...197L..55H) HM90 = Hauck & Mermilliod (1990A&AS...86..107H) J66 = Jones 1966; (in Spectral Classification and Multicolor Photometry, IAU Symp. 24, p.141) KTK88 = Kharitonov et al. 1988; (The Spectroscopic Catalog of Stars, Alma-Ata, Nauka) O67 = Oke (1967ApJ...150..513O) OC66 = Oke & Conti (1966ApJ...143..134O) O74 = Oinas (1974ApJS...27..405O) R69 = Rodriguez (1969, ApJ 5, 125) S65 = Stromgren & Perry 1965 (Photoelectric uvby photometry for 1217 stars brighter than V=6.5, mostly of spectral class A, F, & G (Princeton, Institute for Advanced Study)) S71 = Stickland (1971MNRAS.153..501S) SPO71 = Schild, Peterson, & Oke (1971ApJ...166...95S) T84 = Taylor (1984ApJS...54..259T) vP76 = van Paradijs (1976A&AS...24...53V) W65 = Willstrop (1965, MmRAS 69, 83) W67 = Whiteoak (1967ApJ...150..521W) WBSB62 = Wildey et al. (1962ApJ...135...94W)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD Star's Henry Draper Catalogue number 9- 18 A10 --- Sp Spectral type and luminosity class 19- 23 F5.2 mas D []?=0. Star's angular diameter 25- 28 F4.2 mas e_D []?=0. Error in D 30- 35 F6.2 mag Vmag V magnitude 37- 42 F6.2 mag B-V Johnson B-V color 44- 49 F6.2 mag V-R []?=9. Johnson V-R color 51- 56 F6.2 mag R-I []?=9. Johnson R-I color 58- 64 F7.3 mag b-y []?=9. Stromgren b-y color
Byte-by-byte Description of file: blanket.dat
Bytes Format Units Label Explanations
1- 4 I4 0.1nm Lambda *Central wavelength of bandpass 6- 11 F6.4 --- C0 Zeroth-order polynomial coefficient 13- 19 F7.4 --- C1 First-order polynomial coefficient 21- 27 F7.4 --- C2 Second-order polynomial coefficient 29- 36 F8.4 --- C3 Third-order polynomial coefficient 38- 45 F8.4 --- C4 Fourth-order polynomial coefficient 47- 52 F6.3 --- sigma Std. dev. of data points about the fit 54- 58 F5.2 mag CRb Bluest color index for the fit 60- 64 F5.2 mag CRr Reddest color index for the fit 65- 68 A4 --- LC0 Luminosity class for C0 (no = blank) 69- 72 A4 --- LC1 Luminosity class for C1 (no = blank) 73- 76 A4 --- LC2 Luminosity class for C2 (no = blank) 77- 80 A4 --- LC3 Luminosity class for C3 (no = blank) 81- 84 A4 --- LC4 Luminosity class for C4 (no = blank) 87- 89 A3 --- CI Color index for coefficient
Note on Lambda: The central wavelength of a 50-A wide bandpass to which the coefficients in the same row are applicable.
Origin: AAS CD-ROM series, Volume 6, 1996 Lee Brotzman [ADS] 07-May-1996
(End) [CDS] 06-Sep-1996
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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