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SDOB

Subdwarf O star

A subdwarf O star (sdO) is a type of hot, but low-mass star. O-type subdwarfs are much dimmer than regular O-type main-sequence stars, but with a brightness

Underground nuclear weapons testing

scaled depth of burial (SDOB) of less than 150 caused surface collapse, compared with about half of tests conducted at a SDOB of less than 180. The radius

Jaap Kelderman

player, who played as a goalkeeper for Ajax. Kelderman played in the youth of SDOB from the town of Broek in Waterland, and was later picked up by Dutch giants

Timo Letschert

centre-back. Letschert began his football career with his hometown club, SDOB, before joining Ajax' youth academy at a young age. Ajax let him leave for

Cygnus Loop

behind the Veil. A UV spectrum of this star, KPD 2055+3111 of spectral type sdOB, showed absorption lines in its spectrum indicate that its light is partially

HE 1256−2738

5″ Apparent magnitude (V) 16.46 Distance 1000 ly (310 pc) Spectral type sdOB Other designations HE 1256−2738, EC 12563-2738, USNO-B1.0 0620-00338249 Database

List of smallest known stars

Charpinet, S.; Jeffery, C. S. (2020). "Heavy-metal enrichment of intermediate He-sdOB stars: The pulsators Feige 46 and LS IV-14°116 revisited". Astronomy and

NSVS 14256825

(2012). "A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary". Monthly Notices of the Royal Astronomical Society.

List of O-type stars

X Persei 2,600 ± 100 1 O9.5IIIe-B0Ve 6.778 NSVS 14256825 A 2,700 ± 100 2 sdOB 13.2 Has a M-type companion star. Lambda Cephei 3,098.5 1 O6.5If(n)p +5.050

IW Andromedae

43° 23′ 25.79″ Apparent magnitude (V) 13.7 to 17.3 Characteristics Spectral type sdOB Variable type Z Cam(?) Astrometry Proper motion (μ) RA: +2.471 mas/yr Dec