Richard Irving Anderson

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Publications associées (50)

The iron and oxygen content of LMC Classical Cepheids and its implications for the extragalactic distance scale and Hubble constant Equivalent width analysis with Kurucz stellar atmosphere models

Richard Irving Anderson

Context. Classical Cepheids are primary distance indicators and a crucial stepping stone in determining the present-day value of the Hubble constant H-0 to the precision and accuracy required to constrain apparent deviations from the ACDM Concordance Cosmo ...

2022

Gaia Early Data Release 3 The celestial reference frame (Gaia-CRF3)

Richard Irving Anderson

Context. Gaia-CRF3 is the celestial reference frame for positions and proper motions in the third release of data from the Gaia mission, Gaia DR3 (and for the early third release, Gaia EDR3, which contains identical astrometric results). The reference fram ...

EDP SCIENCES S A2022

Relativistic corrections for measuring Hubble's constant to 1% using stellar standard candles

Richard Irving Anderson

We have estimated relativistic corrections for cosmic distance estimates based on stellar standard candles such as classical Cepheids and stars near the tip of the red giant branch (TRGB stars) with the goal of enabling a future unbiased 1% measurement of ...

2022

New periodograms separating orbital radial velocities and spectral shape variation

Richard Irving Anderson

We present new periodograms that are effective in distinguishing Doppler shift from spectral shape variability in astronomical spectra. These periodograms, building upon the concept of partial distance correlation, separate the periodic radial velocity mod ...

2022

The iron and oxygen content of LMC Classical Cepheids and its implications for the extragalactic distance scale and Hubble constant Equivalent width analysis with Kurucz stellar atmosphere models (vol 658, A29, 2022)

Richard Irving Anderson

2022

The eta Aquilae System: Radial Velocities and Astrometry in Search of eta Aql B

Richard Irving Anderson

The classical Cepheid eta Aql was not included in past Leavitt Law work because of a presumed complicating orbit due to a known B9.8V companion. To determine the orbit of eta Aql B, we analyze a significant number of radial velocity (RV) measurements from ...

2022

Discovery of a Binary-origin Classical Cepheid in a Binary System with a 59 day Orbital Period

Richard Irving Anderson

We report the discovery of a surprising binary configuration of the double-mode Cepheid OGLE-LMC-CEP-1347 pulsating in the first (P-1= 0.690 days) and second-overtone (P-2= 0.556 days) modes. The orbital period (P-orb= 59 days) of the system is five times ...

Iop Publishing Ltd2022

Do the majority of stars form as gravitationally unbound?

Richard Irving Anderson

Context. Some of the youngest stars (age less than or similar to 10 Myr) are clustered, while many others are observed scattered throughout star forming regions or in complete isolation. It has been intensively debated whether such scattered or isolated st ...

2022

Cepheids with Giant Companions. I. Revealing a Numerous Population of Double-lined Binary Cepheids* (dagger)

Richard Irving Anderson

Masses of classical Cepheids of 3-11 M are predicted by theory but those measured clump between 3.6-5 M. As a result, their mass-luminosity relation is poorly constrained, impeding our understanding of basic stellar physics and the Leavitt Law. All Cepheid ...

2021

The surface brightness-colour relations based on eclipsing binary stars and calibrated with EDR3

Richard Irving Anderson

Aims. The surface brightness-colour relation (SBCR) is a basic tool for establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurately determined radii and trigonometric parallaxes allow calibration of t ...

2021

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