What is New ？

Compared with the previous data release, DR9 v2.0, this release introduces the following major updates.

A new field, "vsini_lasp" has been added to the end of the "LAMOST LRS Stellar Parameter Catalog of A, F, G, and K Stars" catalog. This field provides the projected rotational velocity (vsini) calculated by the LAMOST Stellar Parameter pipeline (LASP), for which detailed explanations are available in the low-resolution data documentation. In this release, vsini values have been provided for 176,114 low-resolution spectra and 412,534 medium-resolution combined spectra. For more details, please refer to the work of Zuo F, et al., 2024^[1].

Reference

1.    Zuo F., Luo, A.L., Du B., et al. 2024, Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000K, ApJS, 271, 4