# Reaching for the stars -- JWST/NIRSpec spectroscopy of a lensed star candidate at $z=4.76$

**Authors:** Lukas J. Furtak, Ashish K. Meena, Erik Zackrisson, Adi Zitrin, Gabriel B. Brammer, Dan Coe, José M. Diego, Jan J. Eldridge, Yolanda Jiménez-Teja, Vasily Kokorev, Massimo Ricotti, Brian Welch, Rogier A. Windhorst,  Abdurro'uf, Felipe Andrade-Santos, Rachana Bhatawdekar, Larry D. Bradley, Tom Broadhurst, Wenlei Chen, Christopher J. Conselice  
**arXiv:** [2308.00042](https://arxiv.org/abs/2308.00042)  
**Date:** 2023-07-31  
**Summary page:** https://www.summarizepaper.com/fr/paper/2308.00042v1/

## Abstract

We present JWST/NIRSpec observations of a highly magnified star candidate at a photometric redshift of $z_{\mathrm{phot}}\simeq4.8$, previously detected in JWST/NIRCam imaging of the strong lensing (SL) cluster MACS J0647+7015 ($z=0.591$). The spectroscopic observation allows us to precisely measure the redshift of the host arc at $z_{\mathrm{spec}}=4.758\pm0.004$, and the star's spectrum displays clear Lyman- and Balmer-breaks commensurate with this redshift. A fit to the spectrum suggests a B-type super-giant star of surface temperature $T_{\mathrm{eff,B}}\simeq15000$ K with either a redder F-type companion ($T_{\mathrm{eff,F}}\simeq6250$K) or significant dust attenuation ($A_V\simeq0.82$) along the line of sight. We also investigate the possibility that this object is a magnified young globular cluster rather than a single star. We show that the spectrum is in principle consistent with a star cluster, which could also accommodate the lack of flux variability between the two epochs. However, the lack of a counter image and the strong upper limit on the size of the object from lensing symmetry, $r\lesssim0.5$ pc, could indicate that this scenario is somewhat less likely -- albeit not completely ruled out by the current data. The presented spectrum seen at a time when the Universe was only $\sim1.2$ Gyr old showcases the ability of JWST to study early stars through extreme lensing.