Oops, almost missed Astrophysical Journal Supplement Series, January (vol. 282 #1). It is supplemental:
Galád, A. Podlewska-Gaca, E. Világi, J. et al. A Photometric Survey of over 200 V-type Asteroids and Their Phase-curve Analysis Art 9 ae226f
Dunham, E. T. Liu, M-C. Burman, A. et al. The CAI Database: 26Al-26Mg Isotope Systematics Art 11 ae1835
The V-type asteroids have the spectral absorption feature of pyroxene, plus a high albedo. Just like asteroid (4) Vesta, hence the designation. We also see a ‘trail’ of debris, leading from Vesta, and eventually to Earth. It is thus widely assumed that V-type asteroids (and their corresponding HED meteorites) are, yes, pieces knocked off Vesta, whose volcanism would produce pyroxene and other HED minerals. But is this too simple? Were (are?) there other volcanically-activated asteroids, which could have produced similar-looking fragments? That question is still open. Galád et al. add more fuel to that fire. The more we pursue V-type asteroids, the sooner we will settle that question.
What’s not in V-type asteroids: calcium-aluminum rich inclusions, or CAIs. CAIs are little refractory nuggets, the first solids to form in the nebula that became the Solar System. Formation of the CAIs, then, is considered to be ‘Year 0’ in Solar System history. The volcanism of Vesta and similar asteroids then destroyed their chondrules and CAIs. Dunham et al. now meta-compile our collection of CAI studies (from chondritic meteorites). Yes, there appears to be clustering of the specimens, as previous authors had speculated: is there taxonomy within our CAI population?