emamajek on 12-Sep-2022 08:15:56 GMT about HD 5015
There are some conflicting indications of binarity in the literature for HR 244 = HD 5015, but thus far the star appears to be single.
HR 244 was flagged in the Bright Star Catalog 5th Ed. as "SB1O", i.e. spectroscopic binary with one component, with note "Orbit questioned by Morbey and Griffin (1987, ApJ, 317, 343); proposed period rejected with certainty. Unresolved by speckle interferometry." The claimed SB1 detection and orbit (P=127.95d, K=1.6+-0.2 km/s) comes from Abt & Levy (1976;
1976ApJS...30..273A
). Morbey & Griffin (1987;
1987ApJ...317..343M
): "for HR 244, integration beyond the quality level at 2.2 (period = 127.95 days, as found by Abt and Levy) shows that 100% of random radial-velocity data sets yield quality levels which are equal or better than that for the period of 127.95 days. That period can therefore by rejected with certainty."
Duquennoy & Mayor (1991; 1991A&A...248..485D) analyze 21 CORVEL measurements over 3988 days, and quote mean RV = 20.82 km/s, uncertainty in the mean of 0.05 km/s, and velocity dispersion (rms) of 0.22 km/s, with P(chi2)=0.752. They consider the RV constant, so no sign of binarity.
Abt & Willmarth (2006;
2006ApJS..162..207A
) quote their estimate of the RV to be +20.65 (+-0.17, rms = +-0.15 km/s). They do not flag the star as SB, nor do they cite the original Abt & Levy (1976) result.
Tokovinin+ (2014;
2014AJ....147...86T
) lists speckle observation upper limits and notes "DM91 [Duquennoy & Mayor 1991], Abt2006: RV=const" and considers the system single.
Nordstrom+ (2004; 2004A&A...418..989N) quoted a mean radial velocity of 20.8 km/s, with standard error 0.1 km/s and standard deviation of only 0.2 km/s, for 22 CORAVEL observations over a span of 4474 days. The probability of constant RV was 0.997.
Butler+ (2017;
2017AJ....153..208B
) listed 14 RV measurements over 4 dates spread out over 500 days, with rms ~ 5 m/s.
Gaia Collaboration (2018A&A...616A...1G I/345/rvstdcat) has 16 ground-based RV measurements taken over 3344 days with SOPHIE and ELODIE, and the values appear to be very tightly clustered around 20.682 km/s with standard deviation 0.0153 km/s and no sign of variation. Gaia RVS measured 20 RVs with mean RV = 20.81 km/s and error 0.15 km/s. Gaia DR3 lists RV = 20.68+-0.12 km/s with 19 observations, RVchi2=0.240209, RVamp=0.69 km/s. However this RV amplitude seems at odds with the more accurate ground-based precise RV measurements from Butler+2017, Nordstrom+2004, and Duquennoy+1991.
Comparing Hipparcos and Gaia astrometry, Kervella+2019 reported a tangential velocity anomaly of 68.02+-23.55 m/s (2.89sigma) - and Kervella+2022 reported an updated estimate of 38.97+-11.59 m/s (3.36sigma).
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