论文标题
使用银河开放式群集Cepheids校准CEPHEID时期 - 盖亚带的wesenheit关系
Calibrating the Cepheid Period--Wesenheit Relation in the Gaia Bands using Galactic Open Cluster Cepheids
论文作者
论文摘要
建立该时期 - Wesenheit关系需要对经典头孢虫（DCEP）的独立和准确的距离测量。相关开放群集提供的精确距离独立校准了DCEP的Wesenheit关系。与开放群集相关的51个DCEP使用五维星体信息的约束进行编译。通过直接使用GAIA DR3视差，将Gaia $ G $ band中的Wesenheit关系校准为$ W_G =（-3.06 \ pm 0.11）\ log P +（-2.96 \ pm 0.10）$。与直接采用DCEP视差或使用距离模量来得出的结果相比，基于群集平均视差的wesenheit幅度与该时期具有更紧密的关系。此外，观察到的远处OC-DCEPS的Wesenheit绝对大小与其合适的幅度之间存在系统的偏移。在考虑视差零点校正后，可以减少系统偏移，从而产生$ W_G =（-2.94 \ pm 0.12）\ log P +（-2.93 \ pm 0.11）$的PW关系更好的PW关系。
Establishing the period--Wesenheit relation requires independent and accurate distance measurements of classical Cepheids (DCEPs). The precise distance provided by an associated open cluster independently calibrates the period--Wesenheit relation of DCEPs. 51 DCEPs associated with open clusters are compiled using the constraints of five-dimensional astrometric information. By directly using Gaia DR3 parallax, the period--Wesenheit relation in the Gaia $G$ band is calibrated as $W_G = (-3.06 \pm 0.11) \log P + (-2.96 \pm 0.10)$. Compared with the results derived by directly adopting the DCEP parallaxes or using distance moduli, the Wesenheit magnitudes based on the cluster-averaged parallaxes exhibit a tighter relation with the period. Besides, there is a systematic offset between the observed Wesenheit absolute magnitudes of distant OC-DCEPs and their fitted magnitudes. After considering the parallax zero-point correction, the systematic offset can be reduced, yielding a probably better PW relation of $W_G = (-2.94 \pm 0.12) \log P + (-2.93 \pm 0.11)$.
