SIMBAD references

2016AJ....152....2L - Astron. J., 152, 2-2 (2016/July-0)

Absolute properties of the pre-main-sequence eclipsing binary star NP Persei.


Abstract (from CDS):

NP Per is a well-detached, 2.2 day eclipsing binary whose components are both pre-main-sequence stars that are still contracting toward the main-sequence phase of evolution. We report extensive photometric and spectroscopic observations with which we have determined their properties accurately. Their surface temperatures are quite different: 6420±90 K for the larger F5 primary star and 4540±160 K for the smaller K5e star. Their masses and radii are 1.3207±0.0087 solar masses and 1.372±0.013 solar radii for the primary, and 1.0456±0.0046 solar masses and 1.229±0.013 solar radii for the secondary. The orbital period is variable over long periods of time. A comparison of the observations with current stellar evolution models from MESA indicates that the stars cannot be fit at a single age: the secondary appears significantly younger than the primary. If the stars are assumed to be coeval and to have the age of the primary (17 Myr), then the secondary is larger and cooler than predicted by current models. The Hα spectral line of the secondary component is completely filled by, presumably, chromospheric emission due to a magnetic activity cycle.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: individual: NP Per

VizieR on-line data: <Available at CDS (J/AJ/152/2): table1.dat table4.dat table5.dat table6.dat table7.dat table8.dat>

Simbad objects: 7

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