Special Notice #143: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations */ /*-->*/ HMXB campaign extended until further notice. Tags AAVSO Special Notice RX J0440.9+4431 V420 Aur LS V +44 17 SAX J0635+0533 HMXB AAVSO International Database Read more about Special Notice #143: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations
