[vsnet-chat 1074] luminosity classes of SR/L variables

[Taichi Kato <tkato>]

luminosity classes of SR/L variables

  Regarding the CK Ori topic, I have checked whether how many K giants
or subgiants are listed in the GCVS.  Hipparcos variables are disregarded.

spec.
-----
K0III: HERV463 SRD 8.46 (0.05) V 54.0
K0IIIea LYNST LB: 11.7 12.7 P -
K0IV-V: TAUTW LB: 10.6 11.6 P -
K1.5IIIb DRAVW SRD: 6.0 7.0 V 170
K2III CENV764 SRD 8.84 9.13 V -
K2III OPHkappa LB: 4.1 5.0 P -
K2III SGETZ SRD: 12.7 <16.0 P 270.30
K2IIIe: ORICK SR: 5.9 7.1 V 120
K2V:-K5 ARASS LB 10.2 11.5 P -
K3III CENYZ SR: 10.5 11.0 P -
K3III CYGT LB: 4.91 4.96 V -
K4III MUSmu LB 4.6 4.8 V -
K5III AQLHK LB: 8.9 10.9 P -
K5III CVNAW SR: 4.72 4.81 V -
K5III TAUalpha LB: 0.75 0.95 V -
K8III-M LEOSY SRB 12.2 13.1 P 82

  Well, low-luminosity SR/L stars are indeed rare in the GCVS, and most
of them seem to be 'boring' objects (at least to human eyes) as CK Ori.

  Some of Hipparcos results on them (variablity taken from the Hipparcos
variablity flag):

V463 Her : constant
171133.6 +162439 (2000.0) 843H 0.99 HIP084096 plx=4.24(1.13) (0.01 0.01)

VW Dra: constant
171629.4 +604014 (2000.0) 632H 1.09 HIP084496 plx=6.76(0.54) (0.00 0.01)

V764 Cen: small-amplitude variable
133608.3 -332844 (2000.0) 905HV2 1.21 HIP066358 plx=1.97(1.19) (0.02 0.03) U 9.11-9.29

kappa Oph: constant
165740.2 +092230 (2000.0) 319H 1.16 HIP083000 plx=37.99(0.75) (0.00 0.43)

CK Ori: constant
053019.9 +041217 (2000.0) 621H 1.28 HIP025785 plx=5.68(0.85) (0.00 0.01)

SS Ara: constant
175819.1 -500939 (2000.0) 930H 0.89 HIP087980 plx=2.12(1.56) (0.02 0.51)

T Cyg: constant
204710.7 +342226 (2000.0) 493H 1.29 HIP102571 plx=8.18(0.55) (0.00 0.00)

mu Mus: small-amplitude variable
114814.4 -664853 (2000.0) 475HV1 1.52 HIP057581 plx=7.55(0.52) (0.00 0.06) M 4.85-4.87

   It would be also interesting to note some A stars are listed as SR or L
in the GCVS.

A/Fe-K CRAQT SRD: 11.4 12.5 P 79.145
A0IV NORNS SR: 11.5 12.0 P 130
A6 GEMYZ L: 10.8 11.6 P -

Regards,
Taichi Kato

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