getannotation({"annotations":[{"id":1540,"username":"seb","context":"vizierTable","element":"J/AJ/132/866","creationDate":1298564804000,"parentId":-1,"isAdmin":"true","isPrivate":"false","text":"[link bibcode\u003d2006AJ....132..866R]The authors[/link] have been using the TiO5 features in the spectra to derive both the spectral type (linear relation, equation 1) and the absolute J magnitude (section 5.2). But they use two different relations for deriving M_J, and these two relations are not continuous: there is a nearly 2mag break around TiO5 value 0.4.\r\n\r\nAnd this TiO5 value corresponds to M4 spectral types with the relation 1 they have adopted.\r\n  This gives two \"populations\" of M4V stars, depending on the TiO5 value : distances are derived from the observed magnitude and the computed (with a discontinuity) M_J, giving a sharp discontinuity in distance estimates for M4 stars.","parsedText":"\u003ca href\u003d'http://cdsbib.u-strasbg.fr/cgi-bin/cdsbib?2006AJ....132..866R'\u003eThe authors\u003c/a\u003e have been using the TiO5 features in the spectra to derive both the spectral type (linear relation, equation 1) and the absolute J magnitude (section 5.2). But they use two different relations for deriving M_J, and these two relations are not continuous: there is a nearly 2mag break around TiO5 value 0.4.\u003cbr /\u003e\u003cbr /\u003eAnd this TiO5 value corresponds to M4 spectral types with the relation 1 they have adopted.\u003cbr /\u003e  This gives two \u0026quot;populations\u0026quot; of M4V stars, depending on the TiO5 value : distances are derived from the observed magnitude and the computed (with a discontinuity) M_J, giving a sharp discontinuity in distance estimates for M4 stars.","adminText":"","type":"comment"}],"requestedCatalogue":"J/AJ/132/866"})