Statistical analysis of roAp, He-weak and He-rich stars

Abstract

To enlarge our database of Chemically Peculiar (CP) stars, we compiled published data concerning the He-weak and He-rich stars observed by high-resolution spectroscopy techniques during last decades. Twenty He-weak and 28 He-rich stars have been added to the database. We have also distinguished roAp stars from stars previously identified as Ap stars. To deepen our knowledge on statistical overview of the abundance anomalies versus the physical parameters of stars, we compared our data with previous compilations. We applied statistical tests on our data and found interesting correlations for effective temperature and surface gravity for all type of stars and a few correlations for projected rotation velocity only for He-rich stars. Because of the lack of the data we couldn't check whether being a member of binary system is affecting on chemical peculiarities of those stars.

11 pages, 3 figures, 2 tables

References in corpus (13)

• Evolutionary state of magnetic chemically peculiar stars
• Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
• Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster
• Chemical stratification in the atmosphere of Ap star HD 133792. Regularized solution of the vertical inversion problem
• Discovery of 17 new sharp-lined Ap stars with magnetically resolved lines
• Isotopic anomaly and stratification of Ca in magnetic Ap stars
• The fundamental parameters of the roAp star alpha Circini
• Characterization of Kepler early-type targets
• The magnetic field and spectral variability of the He-weak star HR 2949
• B field in OB stars (BOB): The outstandingly strong magnetic field in the evolved He-strong star CPD-62 2124
• Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E
• The discovery of high-amplitude 10.9-minute oscillations in the cool magnetic Ap star HD 115226
• A search for rapid pulsations in the magnetic cool chemically peculiar star HD3980

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• TESS Cycle 1 observations of roAp stars with 2-min cadence data
• Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions
• HD144941: The most extreme helium-strong star
• Detection of an extremely strong magnetic field in the double-degenerate binary merger product HD 144941
• Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
• BD+30${}^{\circ }$549: young helium-weak silicon star in NGC 1333 star-forming region
• The astrophysical parameters of chemically peculiar stars from automatic methods
• A rare phosphorus-rich star in an eclipsing binary from TESS