HUBBLE SPACE TELESCOPECALSPEC FLUX STANDARDS: SIRIUS (AND VEGA)
- 24 April 2014
- journal article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 147 (6), 127
- https://doi.org/10.1088/0004-6256/147/6/127
Abstract
The Space Telescope Imaging Spectrograph (STIS) has measured the flux for Sirius from 0.17 to 1.01 μm on the Hubble Space Telescope (HST) White Dwarf scale. Because of the cool debris disk around Vega, Sirius is commonly recommended as the primary IR flux standard. The measured STIS flux agrees well with predictions of a special Kurucz model atmosphere, adding confidence to the modeled IR flux predictions. The IR flux agrees to 2%-3% with respect to the standard template of Cohen and to 2% with the Midcourse Space Experiment absolute flux measurements in the mid-IR. A weighted average of the independent visible and mid-IR absolute flux measures implies that the monochromatic flux at 5557.5 Å (5556 Å in air) for Sirius and Vega, respectively, is 1.35 × 10–8 and 3.44 × 10–9 erg cm–2 s–1 Å–1 with formal uncertainties of 0.5%. Contrary to previously published conclusions, the Hipparcos photometry offers no support for the variability of Vega. Pulse pileup severely affects the Hp photometry for the brightest stars.Keywords
This publication has 30 references indexed in Scilit:
- A near-infrared interferometric survey of debris-disc starsAstronomy & Astrophysics, 2013
- ABSOLUTE FLUX CALIBRATION OF THE IRAC INSTRUMENT ON THESPITZER SPACE TELESCOPEUSINGHUBBLE SPACE TELESCOPEFLUX STANDARDSThe Astronomical Journal, 2011
- Establishing HZ43 A, Sirius B, and RX J185635-3754 as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPCAstronomy & Astrophysics, 2006
- First Results from the CHARA Array. VII. Long‐Baseline Interferometric Measurements of Vega Consistent with a Pole‐On, Rapidly Rotating StarThe Astrophysical Journal, 2006
- Hubble Space TelescopeAbsolute Spectrophotometry of Vega from the Far-Ultraviolet to the InfraredThe Astronomical Journal, 2004
- Spectral Irradiance Calibration in the Infrared. XII. Radiometric Measurements from the [ITAL]MIDCOURSE SPACE EXPERIMENT[/ITAL][ITAL]Midcourse Space Experiment[/ITAL]The Astronomical Journal, 2001
- Spectral irradiance calibration in the infrared. II - Alpha Tau and the recalibration of the IRAS low resolution spectrometerThe Astronomical Journal, 1992
- Spectral irradiance calibration in the infrared. I - Ground-based and IRAS broadband calibrationsThe Astronomical Journal, 1992
- Absolute calibration of the infrared flux from Vega at 1.24, 2.20,3.76 and 4.6 m by comparison with a standard furnaceMonthly Notices of the Royal Astronomical Society, 1983
- A survey of interstellar H I from L-alpha absorption measurements. IIThe Astrophysical Journal, 1978