RogerEMoore on 26-Feb-2019 13:53:40 GMT about Wolf 629
Is Wolf 629 a binary star?
Wolf 629 was reported to be a spectroscopic binary with a range of +13 to +46 km/sec (Joy, 1947; star listed as "GC 22805 C"). Five plates were used to make the determination. However, a later study (Mazeh et al., 2001; star as Gliese 643) took 83 spectra over 5,843 days but found no evidence of periodicity. Mazeh et al. wrote, "If Gliese 643 is a spectroscopic binary, the orbital amplitude must be less than about 0.5 kms−1." Despite this, a few papers continue to list Wolf 629 as a spectroscopic binary, without directly measuring its radial velocity (e.g., Speraukas, Bartasiute, Boyle, et al., 2016). Pettersen, Evans & Coleman (1984, p.216), are sharply critical of Joy's work in his 1947 evaluation of Wolf 629 and 630, saying at one point, "Ambiguity remains concerning the identity of the components observed in various circumstances."
One study (Ward-Duong, Patience, De Rosa, et al., 2015) includes Wolf 629 (as HIP 82809) in a table of known spectroscopic binaries in their sample, with periods. The table references Mazeh et al., 2001, which specifically rejects Wolf 629 as binary. This appears to be an erroneous table entry. Table 6 also includes HIP 82817 (= Gliese 644, companion system of Wolf 629) on the line below HIP 82809, with an orbital period (2.9655 days) matching that supposedly for HIP 82809. Mazeh et al., 2001, stated the given orbital period was for Gliese 644 Bab only. The Table 6 entry for HIP 82809 should probably be crossed through.
Wolf 629 has been investigated multiple times for stellar and substellar companions, exoplanets, and circumstellar dust, with negative results to date (Golimowski, Henry, Krist, et al., 2004 [low mass]; Dieterich, Henry, Golimowski, et al., 2012 [substellar]; Avenhaus, Schmid, & Meyer, 2012 [dust]; Bonfils, Delfosse, Udry, et al., 2013 [exoplanets]; Jodar, Perez-Garrido, Diaz-Sanchez, et al., 2013 [stellar]; Davison, White, Henry, et al., 2015 [giant exoplanets]; Ward-Duong, Patience, De Rosa, et al., 2015 [stellar]).
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