A UBV equatorial-extinction star network

Crawford, D. L.; Golson, J. C.; Landolt, A. U.

doi:10.1086/129194

Cited by 20 publications

(14 citation statements)

References 3 publications

(3 reference statements)

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“…Photometric system of the photometer is close to that of Johnson. U BV -magnitudes of the comparison star HD 184790 (V = 8. m 125, B = 8. m 293, U = 7. m 966) were taken from Crawford et al (1971). For IRAS 19336-0400 the precision of IRAS 19336-0400 observations of σ ∼ 0. m 02 was obtained for each of three filters.…”

Section: U Bv -Observations Of Iras 19336-0400mentioning

confidence: 99%

Variability of hot supergiant IRAS 19336-0400 in the early phase of planetary nebula ionization

Архипова¹,

Бурлак²,

Есипов³

et al. 2012

Astron. Lett.

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We present photoelectric and spectral observations of a hot candidate protoplanetary nebulaearly B-type supergiant with emission lines in spectrum -IRAS 19336-0400. The light and color curves display fast irregular brightness variations with maximum amplitudes ∆V = 0 m .30, ∆B = 0 m .35, ∆U = 0 m .40 and color-brightness correlations. By the variability characteristics IRAS 19336-0400 appears similar to other hot protoplanetary nebulae. Based on low-resolution spectra in the range λ 4000-7500Å we have derived absolute intensities of the emission lines Hα, Hβ, Hγ, [SII], [NII], physical conditions in gaseous nebula: ne = 10 4 cm −3 , Te = 7000 ± 1000 K. The emission line Hα, Hβ equivalent widths are found to be considerably variable and related to light changes. By UBV -photometry and spectroscopy the color excess has been estimated: EB−V =0.50-0.54. Joint photometric and spectral data analysis allows us to assume that the star variability is caused by stellar wind variations.

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Section: U Bv -Observations Of Iras 19336-0400mentioning

confidence: 99%

Variability of hot supergiant IRAS 19336-0400 in the early phase of planetary nebula ionization

Архипова¹,

Бурлак²,

Есипов³

et al. 2012

Astron. Lett.

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“…Program stars and faint extinction stars were measured in random order during the night. Extinction stars were selected from the equatorial list of Crawford, Golson, & Landolt (1971). Instrumental magnitudes derived from the corrected count rates were used to measure extinction coefficients from observations made at a range of air masses.…”

Section: Observationsmentioning

confidence: 99%

[CLC][ITAL]uvby[/ITAL][/CLC]β Photometry of Selected Eclipsing Binary Stars

Lacy

2002

The Astronomical Journal

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New uvby observations of 51 eclipsing binary stars are presented, and outside-eclipse averages for 45 of them are given. Many of these binaries are detached main-sequence pairs that have been discovered to be double-lined spectroscopic binaries and appear suitable for determinations of accurate absolute dimensions and masses. Photometric properties are recomputed for 14 of the binaries, for which absolute properties have been published previously. Intercomparisons are made with previous photometry, when available, and notes are given for some individual systems.

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“…b References for B and V measurements : (1) Deutschmann et al 1976 ; ( Johnson & Morgan 1953 ;(8) Nicolet 1978 ;(9) Lutz 1971 ;(10) Sharpless 1962 ;(11) Walker 1969 ;(12) Vogt 1976 ;(13) Hill & Lynas-Gray 1977 ;(14) Johnson et al 1966 ;(15) Walker 1956 ;(16) Oja 1985 ;(17) Schild et al 1983 ;(18) Landolt 1983 ;(19) Thackeray & Andrews 1974 ;(20) Klemola 1962 ;(21) Feinstein 1964 ;(22) Feinstein, Marraco, & Muzzio 1973 ;(23) Massey & Johnson 1993 ;(24) Guetter 1974 ;(25) Humphreys 1973 ;(26) Kilkenny 1974 ;(27) Lynga & Wramdemark 1973 ;(28) Kilkenny et al 1985 ;(29) Hill et al 1974 ;(30) Crawford, Golson, & Landolt 1971 ;(31) GutierrezMoreno & Moreno 1968 ;(32) Fernie 1983 ;(33) Dworetsky et al 1982 ;(34) Cousins & Stoy 1962 ;(35) Penston 1973 ;(36) Schild et al 1969 ;(37) Feinstein & Ferrer 1968 ;(38) Crampton 1971 ;…”

Section: Introductionmentioning

confidence: 99%

IUE Absorption‐Line Observations of the Moderately and Highly Ionized Interstellar Medium toward 164 Early‐Type Stars

Savage

Meade

Sembach

2001

ASTROPHYS J SUPPL S

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We present measurements of Galactic interstellar Al III, Si IV, and C IV absorption recorded in highresolution archival ultraviolet spectra of 164 hot early-type stars observed by the International Ultraviolet Explorer (IUE) satellite. The objects studied were drawn from the list of hot stars scheduled to be observed with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite as part of observing programs designed to investigate absorption by O VI in the Galactic disk and halo. Multiple IUE echelle-mode integrations have been combined to produce a single ultraviolet (1150È1900 spectrum of each star A ) with a spectral resolution of D25 km s~1 (FWHM). Selected absorption-line proÐles are presented for each star along with plots of the apparent column density per unit velocity for each line of the Al III, Si IV, and C IV doublets. We report absorption-line equivalent widths, absorption velocities, and integrated column densities based on the apparent optical depth method of examining interstellar absorption lines. We also determine column densities and Doppler parameters from single-component curve-ofgrowth analyses. The scientiÐc analysis of these observations will be undertaken after the FUSE satellite produces similar measurements for absorption by interstellar O IV, Fe III, S III, and other ions.

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A UBV equatorial-extinction star network

Abstract: Well-observed data are presented for 18 pairs of stars around the celestial equator suitable for use as "extinction stars" in UBV photometry.

Cited by 20 publications

References 3 publications

Variability of hot supergiant IRAS 19336-0400 in the early phase of planetary nebula ionization

Variability of hot supergiant IRAS 19336-0400 in the early phase of planetary nebula ionization

[CLC][ITAL]uvby[/ITAL][/CLC]β Photometry of Selected Eclipsing Binary Stars

IUE Absorption‐Line Observations of the Moderately and Highly Ionized Interstellar Medium toward 164 Early‐Type Stars

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