Visual Observation of the Magellanic Clouds Past and

Visual Observation of the Magellanic Clouds, Past and Present By a Variable Star Observer Photo ESO CC BY 4. 0

Dunlop (1828)

The evolutionary scenario of a 60 -100⊙ star is O star ⇨ Of/WNH ⇨LBV ⇨ WN ⇨ WC ⇨ SN 1 bc LBVs are a brief (and necessary) transition between O-type stars and WR stars and supernovas.

NGC 346 & HD 5980 Aladin Sky Atlas + DSS plates

HD 5980 Credit: NASA, ESA and A. Nota (STSc. I/ESA)

Albert Jones (NZ) - Blue 1987 1994 2016

Peter Williams (Aus) - Blue 1987 1994 2016

AP (Aus) - Blue 1987 1994 2016

NGC 1910 & S Dor RMC 143 V 0733 Aladin Sky Atlas

Aladin Sky Atlas fov approx. 2 degrees V 2302 V 1338 N LMC 92 V 2756 V 3068 S Dor V 1941 N LMC 05 V 1612

Herschel 1847 S Dor

M. Morel’s LMC Atlas

Gaposchkin 1943

Albert Jones (NZ) 2011 2016 1987

Peter Williams (AUS) 2011 2016 1987

AP (Aus) 2011 2016 1987

Aladin Sky Atlas fov approx. 2 degrees V 2302 V 1338 N LMC 92 V 2756 V 3068 S Dor V 1941 N LMC 05 V 1612

Old chart from Albert Jones

M. Morel’s chart for V 2756 Old chart from Albert Jones 2016

Excerpt from Herschel 1847 LMC Chart V 0733 ?

Albert Jones (NZ) 2008 1987

Peter Williams (Aus) 2008 1987

AP (Aus) 2008 1987

RMC 136 RMC 143 Morel LMC Atlas

O star ⇨ Of/WNH ⇨LBV ⇨ WN ⇨ WC ⇨ SN 1 bc They should be the youngest and most luminous stars in their clusters. Study of the MC populations of LBVs has shown that their locations are more distant from their apparent birth clusters than their ages permit, further than the WR stars (Smith & Tombleson 2015)

In A Cluster LMC V 3600 (ETA Carinae may be the only other) Isolated No O stars within 100 pc or more SMC V 2018 In Loose OB Assoc. LMC V 3068 S Dor LH 41 OB assoc. LMC V 1338 LMC V 1941 LH 41 LMC V 2756. RMC 143 in LH 100 LMC V 0733 (300 pc to nearest O Star!) Away from Cluster HD 5980 20– 30 pc from cluster centre, 20 pc from nearest unbound O star *__ are stars we’ve mentioned above *Distances are apparent in the sky, so genuine minimums. *Confirmed LBVs only (Smith & Tombleson 2015). *All in current observing program.

Smith & Tombleson (2014)

Dunlop, J. (1828). Courtesy Mitchell Library. This is a bound excerpt most likely 1828 Phil. Trans. 113 Gaposchkin, S. (1943) Ap. J, 97, 166 G Herschel, J. F. W. , Results of Astronomical Observations Made During The Years 1834, 5, 6, 7, 8 At The Cape Of Good Hope, Smith, Elder and Co. , London, 1847 (courtesy Mitchell Library, Sydney) Koenigsberger, G. , Morrell, N. et al. (2014) AJ, 148, 62 Mc. Connachie, A. W. (2012) AJ, 144, 4 M Morel, M. A Visual Atlas of the Small Magellanic Cloud, 1989, and LMC Visual Atlas 2000, 2001, Morel Astrographics Pickering, C. Fleming, W. (1897) Ap. J, 6, 459 P. Smith, N. (2008) RMx. AC, 33, 154 S Smith, N. , Tombleson, R. (2015) MNRAS, 447, 598 S Stahl, O. , Wolf, B. , et al. (1984) A&A, 140, 459 S Zickgraf, F. , Kovacs, J. (1996) A&A 309, 505 -514