WDS 20181+4044 STF 2666 CD : NOTES
 
 
discov_num notes refcode
CHR 96 Aa,Ab: 1985.8396, 1988.6630, 1989.7061: These new observations were
found from reprocessing unpublished archival data. We are currently McA1993
undertaking a duplicity survey of all bright (V<8) galactic O stars;
this is one of four new binaries found by us so far in this survey. McA1987a
This system is also a known spectroscopic binary, and we are
reanalyzing archival radial velocity data in an attempt to derive
masses via a combined interferometric/spectroscopic orbit (see Gies et Gie1993
al. 1993 for a similar combined solution of the O star 15 Mon).
The estimated period of the speckle binary orbit (CHR 96 Aa) is 31 y.
The orbit quality rating in Table 1 is our own. The system is
currently unresolved with the Mt. Wilson Hooker telescope, but we
continue to observe this target. The brighter star of the speckle
pair is also a 311-day, single-lined spectroscopic binary (McKibben et Bgn1998
al. 1998). The classifications of the C and D components are from Hof1991
Hoffleit & Warren (1991). Msn1998a
Cluster/Main-Sequence fitting determines a cluster distance of Rbr2010b
741 +/- 36 pc.
CHR 96 ten Brummelaar et al. (2011) use a combination of spectroscopic and CIA2011b
CIA 6 astrometric data, including speckle and CHARA Array long-baseline
interferometry, to derive orbits for both the Aa,Ab and Ab1,Ab2 pairs.
Masses for Aa, Ab1, and Ab2 are 21, 23, and 9 Msun, respectively,
effective temperatures are 33, 32.5, and 20 kK.
Distance to Collinder 419 is 1006(+37-34) pc, yielding a mass sum of MzA2019b
76.1(+9.9-7.4) \msun.
 
 
REFERENCES
 
 
refcode metd author reference
Bgn1998 orb - McKibben, W.P., Bagnuolo, W.G., Gies, D.R., Hahula, M.E., Hartkopf, W.I., Roberts, 1998PASP..110..900M
Bgn1998 L.C., Bolton, C.T., Fullerton, A.W., et al.
Bgn1998 PASP 110, 900, 1998
CIA2011b Kf j ten Brummelaar, T.A., O'Brien, D.P., Mason, B.D., Farrington, C.D., 2011AJ....142...21T
CIA2011b +Xh Fullerton, A.W., Gies, D.R., Grundstrom, E.D., Hartkopf, W.I., et al.
CIA2011b +orb AJ 142, 21, 2011
Gie1993 Sc - Gies, D.R., Mason, B.D., Hartkopf, W.I., McAlister, H.A., Frazin, R.A., Hahula, 1993AJ....106.2072G
Gie1993 M.E., Penny, L.R., Thaller, M.L., et al.
Gie1993 AJ 106, 2072, 1993
Hof1991 - Hoffleit, D. & Jaschek, C. 1991bsc..book.....H
Hof1991 The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
McA1987a Sc j McAlister, H.A., Hartkopf, W., Hutter, D., Shara, M., & Franz, O. 1987AJ.....92..183M
McA1987a AJ 92, 183, 1987
McA1993 Sc j McAlister, H.A., Mason, B.D., Hartkopf, W.I., & Shara, M.M. 1993AJ....106.1639M
McA1993 +orb AJ 106, 1639, 1993
Msn1998a Sc j Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G., 1998AJ....115..821M
Msn1998a ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a AJ 115, 821, 1998
MzA2019b orb+- Maiz Apellaniz, J. 2019A&A...630A.119M
MzA2019b +not A&A 630, 119, 2019
Rbr2010b C - Roberts, L.C., Jr., Gies, D.R., Parks, J.R., Grundstrom, E.D., McSwain, M., 2010AJ....140..744R
Rbr2010b Berger, D., Mason, B., ten Brummelaar, T. & Turner, N.
Rbr2010b AJ 140, 744, 2010
 
 
DISCOVERER
 
 
idgroup discov author
1 CHR Center for High Ang. Res. Astronomy (speckle interferometry systems)
3 STF Struve, F.G.W.
36 TAR Tarrant, K.J.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20181+4044 STF2666 CD 2006 5 143 24.3 11.11 10.40 D 201805.63+404324.9
20181+4044 STF2666 CD 2013 7 143 24.2 11.11 10.40 B8V B9V N 201805.63+404324.9
20181+4044 STF2666 CD 2015 8 143 24.2 10.70 11.00 B8V+B9V N 201805.63+404324.9
20181+4044 STF2666 CD 2018 9 143 24.1 10.70 11.00 B8V+B9V N 201805.63+404324.9

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