Bolometric Flux Estimation for Cool Evolved Stars

Belle, Gerald van; Creech‐Eakman, M. J.; Ruiz-Velasco, A. E.

doi:10.3847/0004-6256/152/1/16

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…METHODS AND DATA 3.1. SED Fitting In order to obtain accurate stellar angular sizes, each star was fit with a model spectral energy distribution using the fitting routine sedFit, written by A. Boden (van Belle & von Braun 2009;van Belle et al 2016). sedFit uses an effective temperature T eff on input, which is mapped to a corresponding Pickles (Pickles 1998) spectral template.…”

Section: Importance Of Calibrators With Known Angular Diameters For Imentioning

confidence: 99%

A Catalog of Calibrator Stars for Next-Generation Optical Interferometers

Swihart

Garcia

Stassun

et al. 2016

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Benchmark stars with known angular diameters are key to calibrating interferometric observations. With the advent of optical interferometry, there is a need for suitably bright, well-vetted calibrator stars over a large portion of the sky. We present a catalog of uniformly computed angular diameters for 1523 stars in the northern hemisphere brighter than V = 6 and with declinations −15• < δ < 82• . The median angular stellar diameter is 0.527 mas. The list has been carefully cleansed of all known binary and multiple stellar systems. We derive the angular diameters for each of the stars by fitting spectral templates to the observed spectral energy distributions (SEDs) from literature fluxes. We compare these derived angular diameters against those measured by optical interferometry for 75 of the stars, as well as to 176 diameter estimates from previous calibrator catalogs, finding in general excellent agreement. The final catalog includes our goodness-of-fit metrics as well as an online atlas of our SED fits. The catalog presented here permits selection of the best calibrator stars for current and future visible-light interferometric observations.

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Section: Importance Of Calibrators With Known Angular Diameters For Imentioning

confidence: 99%

A Catalog of Calibrator Stars for Next-Generation Optical Interferometers

Swihart

Garcia

Stassun

et al. 2016

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“…We have previously used the sedFit code in similar investigations (van Belle et al , 2013(van Belle et al , 2016; van Belle & von Braun 2009) for determinations of F bol and A V .…”

Section: Sedfit Processmentioning

confidence: 99%

Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V − K Color

Belle

Braun

Ciardi

et al. 2021

ApJ

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We calculate directly determined values for effective temperature (T eff) and radius (R) for 191 giant stars based upon high-resolution angular size measurements from optical interferometry at the Palomar Testbed Interferometer. Narrow- to wideband photometry data for the giants are used to establish bolometric fluxes and luminosities through spectral energy distribution fitting, which allows for homogeneously establishing an assessment of spectral type and dereddened V 0 − K 0 color; these two parameters are used as calibration indices for establishing trends in T eff and R. Spectral types range from G0III to M7.75III, V 0 − K 0 from 1.9 to 8.5. For the V 0 − K 0 = {1.9, 6.5} range, median T eff uncertainties in the fit of effective temperature versus color are found to be less than 50 K; over this range, T eff drops from 5050 to 3225 K. Linear sizes are found to be largely constant at 11 R ⊙ from G0III to K0III, increasing linearly with subtype to 50 R ⊙ at K5III, and then further increasing linearly to 150 R ⊙ by M8III. Three examples of the utility of this data set are presented: first, a fully empirical Hertzsprung–Russell diagram is constructed and examined against stellar evolution models; second, values for stellar mass are inferred based on measures of R and literature values for log g ; finally, an improved calibration of an angular size prediction tool, based upon V and K values for a star, is presented.

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Analysis of Stellar Continua

2021

The Observation and Analysis of Stellar Photospheres

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Bolometric Flux Estimation for Cool Evolved Stars

Cited by 5 publications

References 23 publications

A Catalog of Calibrator Stars for Next-Generation Optical Interferometers

A Catalog of Calibrator Stars for Next-Generation Optical Interferometers

Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V − K Color

Analysis of Stellar Continua

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