Far-ultraviolet spectra and flux distributions of some Orion stars

Carruthers, G. R.; Heckathorn, H. M.; Opal, C. B.

doi:10.1086/158651

Cited by 11 publications

(4 citation statements)

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“…The calibration of the flight instruments were based on reference to NBS photodiodes. They found that their fluxes from 1200 A down to about 1050 A were in good agreement with the earlier calibrations of Carruthers et al (1981) and the earlier Johns Hopkins calibration of Brune et al (1979). Shortward of 1050 A the Voyager fluxes were 60/6 higher and the Brune fluxes 60% lower than Carruthers.…”

supporting

confidence: 67%

The Role of Space Observations in The Calibration of Fundamental Stellar Quantities

Code

1985

Symp. - Int. Astron. Union

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This paper summarizes the current status of ultraviolet spectrophotometry with emphasis on the instrumental characteristics unique to space observations and on the application of existing data to the calibration of stellar properties. The currently available data bases will be briefly reviewed. When combined with ground based data, ultraviolet observations provide information on effective temperatures and bolometric corrections for early type stars and on the nature of the intervening interstellar medium. The ultraviolet measurements are sensitive to chemical composition differences and provide a powerful tool in discussion of stellar evolution in composite systems. This review concludes with a brief discussion of future directions in instrumentation and analysis.

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supporting

confidence: 67%

The Role of Space Observations in The Calibration of Fundamental Stellar Quantities

Code

1985

Symp. - Int. Astron. Union

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“…The consequence is that large flux differences, of up to a factor of ten at certain wavelengths, are found between observations of the same star taken with different instruments, and none of them agrees with Kurucz model atmospheres below 1000 Å. Voyager (Chávez, Stalio, & Holberg 1995) and HUT (Buss, Kruk, & Ferguson 1995) observations report fluxes higher than the model predictions below 1200 Å. On the other hand, rocket observations (Brune et al 1979;Carruthers, Heckathorn, & Opal 1981;Woods, Feldman, & Bruner 1985;Cook, Cash, & Snow 1989) gave substantially lower fluxes than those from Voyager, and also lower than the fluxes predicted by Kurucz model atmospheres.…”

Section: Introductionmentioning

confidence: 95%

“…Voyager (Chávez, Stalio, & Holberg 1995) and HUT (Buss, Kruk, & Ferguson 1995) observations report fluxes higher than the model predictions below 1200Å. On the other hand, rocket observations (Brune et al 1979;Carruthers, Heckathorn, & Opal 1981;Woods, Feldman, & Bruner 1985;Cook, Cash, & Snow 1989) gave substantially lower fluxes than those from Voyager, and also lower than the fluxes predicted by Kurucz model atmospheres.…”

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confidence: 93%

Far‐Ultraviolet Absolute Flux of α Virginis

Morales

Trapero

Gómez

et al. 2000

ApJ

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We present the far ultraviolet spectrum of α Virginis taken with EURD spectrograph on-board MINISAT-01. The spectral range covered is from ∼ 900 to 1080Å with 5Å spectral resolution. We have fitted Kurucz models to IUE spectra of α Vir and compared the extension of the model to our wavelengths with EURD data. This comparison shows that EURD fluxes are consistent with the prediction of the model within ∼ 20 − 30 %, depending on the reddening assumed. EURD fluxes are consistent with Voyager observations but are ∼60% higher than most previous rocket observations of α Vir.

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“…Observations by Voyager (Broadfoot at al. 1977), Copernicus (Rogerson et al 1973), HUT (Davidsen 1990), ORFEUS (Hurwitz & Bowyer 1991), and UVSTAR (Stalio et al 1993), and rocket observations by Brune, Mount, & Feldman (1979), Carruthers, Heckathorn, & Opal (1981), have provided some data. The absolute fluxes obtained by these investigations are often highly discrepant for a variety of reasons.…”

Section: Introductionmentioning

confidence: 99%

Far‐Ultraviolet Spectra of B Stars near the Ecliptic

Morales¹,

Orozco²,

Gómez³

et al. 2001

ApJ

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Spectra of B stars in the wavelength range of 911-1100Å have been obtained with the EURD spectrograph onboard the Spanish satellite MINISAT-01 with ∼ 5Å spectral resolution. IUE spectra of the same stars have been used to normalize Kurucz models to the distance, reddening and spectral type of the corresponding star. The comparison of 8 main-sequence stars studied in detail (α Vir, ǫ Tau, λ Tau, τ Tau, α Leo, ζ Lib, θ Oph, and σ Sgr) shows agreement with Kurucz models, but observed fluxes are 10-40% higher than the models in most cases. The difference in flux between observations and models is higher in the wavelength range between Lyman α and Lyman β. We suggest that Kurucz models underestimate the FUV flux of main-sequence B stars between these 1 Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration

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Far-ultraviolet spectra and flux distributions of some Orion stars

Cited by 11 publications

References 0 publications

The Role of Space Observations in The Calibration of Fundamental Stellar Quantities

The Role of Space Observations in The Calibration of Fundamental Stellar Quantities

Far‐Ultraviolet Absolute Flux of α Virginis

Far‐Ultraviolet Spectra of B Stars near the Ecliptic

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