论文标题
使用几何距离测定，随着红色分支尖端的新校准，轴突和中微子边界改善了
Axion and neutrino bounds improved with new calibrations of the tip of the red-giant branch using geometric distance determinations
论文作者
论文摘要
红色巨型分支（TRGB）的尖端的亮度使人们可以限制新的能量损失，从而导致氦点火时的核心质量更大，从而比标准恒星模型的预期更明亮的TRGB。所需的绝对TRGB校准通过可靠的几何距离有了可靠的几何距离，这些距离已适用于Galaxy NGC 4258，该Galaxy NGC 4258带有水象征物，并基于20个脱落的二进制二进制二进制二进制物，可容纳水。此外，我们通过基于GAIA DR2数据的最新运动学距离确定了球状群集$ω$ CENTAUR中的先前TRGB校准。所有这些校准都具有相似的不确定性，并且相互同意，并且与最近的专用恒星模型。因此，使用NGC 4258作为最干净的伴形案例，我们在$ g_ {ae} <1.6 <1.6 \ times10^{ - 13} $和$μ_ν<1.5 \ 1.5 \ 1.5 \ times10^{-12} $ _ {-12} $ rm b b} on-nip oon（a-rm b b} on-nip in a-55 clinlion oon in a axion-electron耦合上的更新约束而$ω$ CENTAURI作为最佳的银河系目标提供$ g_ {ae} <1.3 \ times10^{ - 13} $和$μ_ν<1.2 \ times10^{ - 12}μ__{\ rm b} $。降低的观察误差表明，恒星进化论和辐射测量校正开始主导整体不确定性。
The brightness of the tip of the red-giant branch (TRGB) allows one to constrain novel energy losses that would lead to a larger core mass at helium ignition and thus to a brighter TRGB than expected by standard stellar models. The required absolute TRGB calibrations strongly improve with reliable geometric distances that have become available for the galaxy NGC 4258 that hosts a water megamaser and to the Large Magellanic Cloud based on 20 detached eclipsing binaries. Moreover, we revise a previous TRGB calibration in the globular cluster $ω$ Centauri with a recent kinematical distance determination based on Gaia DR2 data. All of these calibrations have similar uncertainties and they agree with each other and with recent dedicated stellar models. Using NGC 4258 as the cleanest extra-galactic case, we thus find an updated constraint on the axion-electron coupling of $g_{ae}<1.6\times10^{-13}$ and $μ_ν<1.5\times10^{-12}μ_{\rm B}$ (95\% CL) on a possible neutrino dipole moment, whereas $ω$ Centauri as the best galactic target provides instead $g_{ae}<1.3\times10^{-13}$ and $μ_ν<1.2\times10^{-12}μ_{\rm B}$. The reduced observational errors imply that stellar evolution theory and bolometric corrections begin to dominate the overall uncertainties.
