Photonic Passbands and Zeropoints for the Stromgren uvby system

Abstract

Photonic passbands have been derived for the uvby standard system by convolving the original filter passbands of Strömgren and Perry with atmospheric extinction and the QE of a cooled 1P21 photomultiplier tube. Using these new passbands, synthetic photometry was calculated for all the stars in the extensive NGSL and MILES spectrophotometric libraries and compared with the homogenised b-y, m1 and c1 indices in the Hauck-Mermilliod 1998 catalog and the derived u - v and v - b colors. Excellent agreement between observed and synthetic photometry was achieved with regression slopes near unity. Slightly better fits were obtained by considering stars with b-y < 0.5 and b-y > 0.5, separately. It is recommended that these new passbands be used together with the provided transformation equations to generate synthetic photometry from model atmosphere fluxes and observed spectrophotometry. Synthetic photometry was also carried out using the natural system of the 4-channel spectrograph-photometers and those of Cousins and Eggen in order to explore the systematic dfferences that could be expected between their instrumental systems and the standard system.

15 pages, including 10 figures

Cited by in corpus (15)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Spectrophotometric Libraries, Revised Photonic Passbands and Zero-points for UBVRI, Hipparcos and Tycho Photometry
• The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
• Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra
• Revised Filter Profiles and Zero Points for Broadband Photometry
• A Volume-Limited Survey of mCP Stars Within 100pc I: Fundamental Parameters and Chemical Abundances
• MOBSTER - II. Identification of rotationally variable A stars observed with \emph{TESS} in Sectors 1 to 4
• The Stagger-grid: A grid of 3D stellar atmosphere models V. Synthetic stellar spectra and broad-band photometry
• Non-conservative evolution in Algols: where is the matter?
• Visual and ultraviolet flux variability of the bright CP star $\theta$ Aur
• Photometric evolution, orbital modulation and progenitor of Nova Mon 2012
• The slowly pulsating B-star 18 Peg: A testbed for upper main sequence stellar evolution
• The GALANTE Photometric System
• A revised simplified scattering model for the moonlit sky brightness profile based on photometry at SAAO