Mathematics – Logic
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kfnt...17..291p&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 17, no. 4, p. 291-312
Mathematics
Logic
1
Scientific paper
Some conclusions were drawn from the analysis of the following specific features of the rapid Algol-Like Irregular VARiable Stars (ALIVARS): 1) general mode of variability for ALIVARS and R CrB, 2) long periods of nearly constant brightness, 3) specific "color - V-magnitude" dependence,4) Anticorrelation between V brightness and degree of polarization, 5) identity of the optical properties of the RCB and ALIVARS circumstellar dust, 6) cyclic light variations at normal brighness, 7) connection between cyclic light variations and the onset of drastic light fadings. We found that ALIVARS have some morphological features more in common with evolved RCB-type stars rather than with young Herbig Ae/Be stars. Moreover, the results of the analysis of the ALIVARS evolution characteristic - a) space distribution of individual ALIVARS and star formation regions, b) loci on the H-R diagram, c) equivalent widths of hydrogen absorption lines, d) relative hydrogen deficiency of two ALIVARS investigated (70% of the solar abundance for V 351 Ori and 30% for RZ Psc), e) mean group parameter Vsini of ALIVARS, f) luminosity of ALIVARS �alpha emission envelopes - unambiguously point that ALIVARS are not so young as Herbig Ae/Be stars and they have left the main sequence. Thus, we have encountered the fact of stellar mimicry: ALIVARS tend to look out as young stars, having at that time features of rather evolved stars. Relying on such findings, we conclude the same ALIVARS should not be further regarded as young stars of the HAEBES group.
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